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Looking forward, pushing back and peering sideways: analyzing the sustainability of industrial symbiosis.

INTRODUCTION
  Waste is "raw material in the wrong place" (Boons 2008,
  p. 149--citing Talbot 1919 Millions From Waste)


Garbage has earned a bad reputation and with good reason. Waste costs Americans billions of dollars annually in disposal and clean-up costs (Standard and Poor's 2009). (1) Managers have invested considerably in reducing waste within industrial supply chains through total quality management (Corbett and Klassen 2006), as well as reducing pollution by greening their supply chains (Handfield, Walton, Seegers and Melnyk 1997), pollution control (Klassen and Whybark 1999) and pollution prevention (Vachon and Klassen 2006).

The field of industrial symbiosis Industrial Symbiosis
Industrial Symbiosis is a type of eco-industrial development which is an application of the concept of industrial ecology. Industrial ecology is a relatively new field that is based on the ideology of nature.
 also addresses waste that moves between organizations. Industrial symbiosis involves the use of one firm's residual resources and byproducts as feedstock feed·stock  
n.
Raw material required for an industrial process.

Noun 1. feedstock - the raw material that is required for some industrial process
raw material, staple - material suitable for manufacture or use or finishing
 for another (Chertow 2000). It applies the well-worn cliche: one man's waste is another man's treasure. Wastes such as fly ash fly ash
n.
Fine particulate ash sent up by the combustion of a solid fuel, such as coal, and discharged as an airborne emission or recovered as a byproduct for various commercial uses.

Noun 1.
, waste water, steam, heat, sulfur and carbon dioxide carbon dioxide, chemical compound, CO2, a colorless, odorless, tasteless gas that is about one and one-half times as dense as air under ordinary conditions of temperature and pressure.  ([CO.sub.2]), for example, have formed the foundation of profitable resource exchanges. In effect, firms create value from their waste products by forming creative interorganizational relationships.

Many such interorganizational arrangements have emerged globally. Regional and colocated organizational networks sharing residua re·sid·u·a  
n.
Plural of residuum.
] resources have been identified in Kalundborg, Denmark (Ehrenfeld and Gertler 1997), Kwinana, Australia (van Beers, Corder, Bossilkov and van Berkel 2007), Sarnia, Canada (Venta and Nisbet 1997), Nova Scotia, Canada (Cote and Hall 1995), Rotterdam, Netherlands (Baas and Boons 2004), Queensland, Australia (Roberts 2004), Styria, Austria (Schwarz and Steininger 1997) and throughout the United States United States, officially United States of America, republic (2005 est. pop. 295,734,000), 3,539,227 sq mi (9,166,598 sq km), North America. The United States is the world's third largest country in population and the fourth largest country in area.  (Heeres, Vermeulen and de Walle 2004).

Although research in both supply chains and industrial symbiosis both aim to reduce waste between organizations, surprisingly little industrial symbiosis research has penetrated the research stream on supply chains. Yet, research in industrial symbiosis could help inform an understanding of sustainable development Sustainable development is a socio-ecological process characterized by the fulfilment of human needs while maintaining the quality of the natural environment indefinitely. The linkage between environment and development was globally recognized in 1980, when the International Union  in supply chains.

Whereas the emphasis in supply chain research is waste reduction within a firm, the emphasis in industrial symbiosis is waste reduction over the entire system of firms. In this paper, we argue that this focus on the system of firms facilitates sustainable development. Industrial symbiosis not only reduces pollution, but the tight network of interorganizational relationships fosters social equity and economic prosperity--all hallmarks of sustainable development. As noted in the Call for Papers for this Special Topic Forum, there is much more emphasis in the supply chain literature on the environmental and economic dimensions of sustainable development than on the social equity dimension. A deeper understanding of industrial symbiosis can help inform sustainable development in the context of supply chains.

In this paper, we compare and contrast these two types of interorganizational relationships and illustrate how industrial symbiosis supports sustainable development. Although this manuscript is primarily conceptual in nature, the ideas have been informed by exploratory interviews with members of companies and nongovernment organizations in the Sarnia-Lambton region of Southwestern Ontario Southwestern Ontario is a region of the Canadian province of Ontario, centred on the city of London. It extends north to south from the Bruce Peninsula on Lake Huron to the Lake Erie shoreline, and east to south-west roughly from Kitchener to Windsor.  in Canada. This region is home to over 130,000 people and was established in the late 1800s to exploit local oil fields This list of oil fields includes major fields of the past and present. The list is incomplete; there are more than 40,000 oil and gas fields of all sizes in the world[1]. . Although there are few remaining fossil fuel fossil fuel: see energy, sources of; fuel.
fossil fuel

Any of a class of materials of biologic origin occurring within the Earth's crust that can be used as a source of energy. Fossil fuels include coal, petroleum, and natural gas.
 resources, the petrochemical firms and their physical infrastructure still form the economic backbone of the region. Local firms now refine imported oil into gasoline, polymers, carbon black, rubbers, fertilizers and ethylene ethylene (ĕth`əlēn') or ethene (ĕth`ēn), H2C=CH2, a gaseous unsaturated hydrocarbon. It is the simplest alkene. . The region has a strong community, with established industrial and regional nongovernmental organizations Transnational organizations of private citizens that maintain a consultative status with the Economic and Social Council of the United Nations. Nongovernmental organizations may be professional associations, foundations, multinational businesses, or simply groups with a common interest in , furthering interfirm collaboration in terms of education, safety, environment and health.

This paper proceeds in four parts. In the first section, we review the more conventional views of supply chains, describing forward flows of products toward end users and the reverse flow of end-of-life products back into the supply chain for remanufacturing. We then introduce industrial symbiosis, and suggest that residual wastes create a "sideways" flow of products. In the third section, we discuss the implications of industrial symbiosis for sustainability. In the final section, we identify challenges associated with industrial symbiosis and offer insights into how these challenges can be overcome.

SUPPLY CHAINS: LOOKING FORWARD AND PUSHING BACKWARD

The conventional view of supply chains depicts them as linear flows of physical goods, information and funds between firms and the end users of products (Mentzer, DeWitt, Keebler, Min, Nix, Smith and Zacharia 2001). Physical goods flow downstream, funds flow upstream and critical information on inventory and forecasts flow both ways (Harrison, Lee and Neale 2003). Supply chains involve multiple suppliers and multiple customers, yet because firms focus on a subset of strategically important suppliers and products, supply chains are often conceptualized with a linear orientation (Tan 2002; Rungtusanatham, Salvador, Forza and Choi 2003).

Supply chain researchers recognize the importance of cooperation and integration among supply chain partners. Both broader integration of upstream suppliers and downstream customers through information exchanges (Frohlich and Westbrook 2001), and smoother integration through faster cycle times and smaller batches (Cachon and Fisher 2000; Steckel, Gupta and Banerji 2004), have been shown to generate significant value for supply chain partners. Failing to cooperate could result in a bullwhip bull·whip  
n.
A long, plaited rawhide whip with a knotted end.

tr.v. bull·whipped, bull·whip·ping, bull·whips
To whip or beat with a bullwhip.
 effect--small changes in customer demand can be amplified, resulting in large and costly fluctuations in orders (Lee, Padmanabhan, and Whang 1997).

This integration results in supply chains taking on the appearance of a virtual organization (Dyer and Singh 1998; Lambert and Cooper 2000). They are the modern form of a central organizing unit (Miles and Snow 2007), and generate a sense of identity and solidarity. Firms not only compete directly with other firms, but also cooperate with other members of their supply chain to compete against other supply chains (Ketchen and Hult 2007).

Throughout the supply chain, firms simultaneously generate waste and pollution that can compromise profits and harm the natural environment. Supply chain researchers have focused their primary attention in emphasizing manufacturing and management processes within single firms. Firms can control pollution through end-of-pipe remediation and environmental management systems, such as ISO (1) See ISO speed.

(2) (International Organization for Standardization, Geneva, Switzerland, www.iso.ch) An organization that sets international standards, founded in 1946. The U.S. member body is ANSI.
 14001.

A more recent stream of research is also considering the disposal of the end-of-life products. Products at their end-of-life stage have little value to the end consumer; yet there remains residual value Residual value

Usually refers to the value of a lessor's property at the time the lease expires.


residual value

The price at which a fixed asset is expected to be sold at the end of its useful life.
 in the waste, which has motivated researchers to investigate reverse supply chains (Guide and van Wassenhove 2001). Reverse supply chains reuse, recycle and remanufacture end-of-life products for inclusion in forward supply chains (Kocabasoglu, Prahinski, and Klassen 2007). This practice closes the supply chain loop. In these reverse supply chains, upstream manufacturers become the downstream customers. For example, single-use cameras are remanufactured into new cameras when customers return their film for processing (Savaskan, Bhattacharya, and van Wassenhove 2004). The photo developing lab, therefore, becomes the supplier of the raw material, which flows back to the manufacturer.

Supply chain research, however, has not fully won the battle on waste. Waste is created in each step of the supply chain. Further, the waste contains considerable residual value, such as [CO.sub.2] emissions, spent solvents, off-specification products, chemical intermediates and un used scrap materials. Further, reverse supply chains depend on a sufficient and sustained supply of end-of-life products to justify the costly investments reverse supply chains require (Geyer, van Wassenhove, and Atasu 2007). In the next section, we show how industrial symbiosis addresses this waste and captures residual value.

INDUSTRIAL SYMBIOSIS: PEERING SIDEWAYS

Defining Industrial Symbiosis

Industrial symbiosis occurs when a firm's manufacturing waste forms the feedstock for another firm (Frosch and Gallopoulos 1989). Waste, such as low-grade heat energy, water and byproducts, can lead to collaborative opportunities between otherwise independent organizations (Chertow 2000). The supply manager provides a "sink" for the supplier's waste, productively using by products and chemical intermediates.

Industrial symbiosis is designed on a natural ecosystems metaphor in which two dissimilar organisms mutually benefit from a relationship (Chertow 2000; Ehrenfeld 2004). The implementation of this ecological metaphor has taken many forms. Industrial symbiosis has been studied in regional industrial symbiosis networks (Baas and Boons 2004; Mirata 2004; Ashton 2008; Howard-Grenville and Paquin 2009), eco-industrial parks (Cote and Hall 1995; Roberts 2004; Jacobsen 2006) and even within a single business group (Zhu and Cote 2004). It covers cases in sugar production (Zhu and Cote 2004), pharmaceuticals (Ashton 2008), harbors (Baas and Boons 2004), pulp and paper (Korhonen 2002) and heavy industrial sites (Ehrenfeld and Gertler 1997; Jacobsen 2006).

The industrial park at Kalundborg, Denmark, is the most cited exemplar ex·em·plar  
n.
1. One that is worthy of imitation; a model. See Synonyms at ideal.

2. One that is typical or representative; an example.

3. An ideal that serves as a pattern; an archetype.

4.
 of industrial symbiosis. This park is anchored by four major industrial players: the Asnaes power station, a Statoil oil refinery, a Novo Nordisk's pharmaceutical plant and Gyproc, a wallboard manufacturer. Their wastes, including heat, water, flue gas Flue gas is gas that exits to the atmosphere via a flue, which is a pipe or channel for conveying exhaust gases from a fireplace, oven, furnace, boiler or steam generator. Quite often, it refers to the combustion exhaust gas produced at power plants. , steam, fly ash and scrubber sludge sludge (sluj) a suspension of solid or semisolid particles in a fluid which itself may or may not be a truly viscous fluid.

sludge

a suspension of solid or semisolid particles in a fluid.
, have spawned a variety of waste reuse and remanufacturing relationships over the course of 35 years. In one process, sulfur dioxide sulfur dioxide, chemical compound, SO2, a colorless gas with a pungent, suffocating odor. It is readily soluble in cold water, sparingly soluble in hot water, and soluble in alcohol, acetic acid, and sulfuric acid.  is removed from flue gas yielding gypsum gypsum (jĭp`səm), mineral composed of calcium sulfate (calcium, sulfur, and oxygen) with two molecules of water, CaSO4·2H2O. It is the most common sulfate mineral, occurring in many places in a variety of forms.  that then supplies a wallboard manufacturer. In another, nickel and vanadium are reclaimed from fly ash for use in the manufacture of cement. In yet another example, waste-water is cascaded between multiple partners, cutting water consumption by 25 percent (Ehrenfeld and Gertler 1997). In total, over 11 exchanges are evident in this industrial community.

In contrast to Kalundborg's tightly knit Adj. 1. tightly knit - closely and firmly integrated; "a tight-knit organization"
tight-knit

integrated - formed into a whole or introduced into another entity; "a more closely integrated economic and political system"- Dwight D.
 network of symbiotic relationships This is an incomplete list of notable mutualistic symbiotic relationships, in which different species have a cooperative or mutually dependent relationship.
  • Humans and cultivated plants
  • Humans and domesticated animals
  • Humans and intestinal bacteria
 among industrial partners, Sarnia-Lambton is dotted with pockets of symbiotic symbiotic /sym·bi·ot·ic/ (sim?bi-ot´ik) associated in symbiosis; living together.

sym·bi·ot·ic
adj.
Of, resembling, or relating to symbiosis.
 activity. We outline four such symbiotic relationships in Table I and discuss each in turn.
TABLE I

Industrial Symbiotic Relationships in Sarnia Lambton

Company             Description          Nature of       Byproduct
                                         Exchange          Flow

Terra Industries    Small North        Sells low-grade   Low-grade
                    American           heat and          heat and
                    fertilizer         [CO.sub.2] for    [CO.sub.2]
                    company with       use by
                    1,000 employees;   Enviro-Fresh, a
                    150 employees at   colocated
                    the                greenhouse
                    Sarnia-Lambton     operation
                    plant

                                       Sells [CO.sub.2]  [CO.sub.2]
                                       to Air Liquide
                                       for use in soda
                                       drinks

                                       Sells excess      Ammonia
                                       ammonia solution  solution
                                       to power plants
                                       in order to
                                       reduce nitrogen
                                       oxide pollution

Cabot Canada        Medium-sized       Buys residual     Residual oil
                    international      oil feedstock     feedstock
                    fine-particle      from a local oil
                    manufacturer       refinery and
                    based in North     uses this for
                    America with       the production
                    4,500 employees    of carbon black

                                       Plans to reduce   Carbon black
                                       land filling of
                                       carbon products
                                       by increasing
                                       sales to
                                       facilities that
                                       convert product
                                       to other forms
                                       of energy

LANXESS             Specialty          Chemical          Butadiene
                    chemical company   Butadiene is an
                    with sales of EUR  intermediate
                    6.58 billion in    that can be used
                    2008 and 14,600    to produce
                    employees in 23    plastics and
                    countries. The     vinyls
                    company is
                    represented at 44
                    production sites
                    worldwide. The
                    core business of
                    LANXESS is the
                    development,
                    manufacturing,
                    and marketing of
                    plastics, rubber,
                    intermediates and
                    specialty
                    chemicals.

                                       Receives their    Crude oil
                                       core crude oil    mixture
                                       feedstock, which
                                       is a co-product
                                       from a local
                                       upstream natural
                                       gas cracking
                                       facility

Suncor Energy Inc.  Integrated energy  Captures and      [CO.sub.2]
                    company. Suncor's  sells [CO.sub.2]
                    operations         for use in soda
                    include oil sands  drinks
                    development and
                    upgrading,
                    conventional and
                    offshore oil and
                    gas production,
                    petroleum
                    refining, and
                    product
                    marketing. The
                    Sarnia-Lambton
                    ethanol plant has
                    50 employees.

                                       Sells dried       DDG
                                       distiller grains
                                       (DDGs) to cattle
                                       farmers for
                                       feed


The first example is Terra Industries. Figure 1 illustrates both Terra's conventional supply chain and industrial symbiosis activities. Terra Industries draws raw materials, including natural gas, power, air and water, from the natural environment and from suppliers. Terra transforms those resources into a variety of nitrogen-based fertilizers, including granulated gran·u·late  
v. gran·u·lat·ed, gran·u·lat·ing, gran·u·lates

v.tr.
1. To form into grains or granules.

2. To make rough and grainy.

v.intr.
 urea and urea and ammonia nitrate solution in various concentrations. Through this process, Terra generates three streams of valuable byproducts: steam, [CO.sub.2] and ammonia. The first byproduct by·prod·uct or by-prod·uct  
n.
1. Something produced in the making of something else.

2. A secondary result; a side effect.

Noun 1.
 stream is comprised of [CO.sub.2] emissions and residual heat. Both streams are low grade; the [CO.sub.2] is blended with air and thus costly to reclaim, and the steam is not hot enough to drive a turbine. However, an innovative arrangement with Enviro-Fresh, a greenhouse operator, has put both of these streams to productive use; the residual steam heats the greenhouse and the [CO.sub.2] increases crop yields. In addition to low-grade [CO.sub.2], Terra also generates pure [CO.sub.2] as a byproduct that it pipes to Air Liquide, a gas specialist. Air Liquide sells the [CO.sub.2] to beverage manufacturers, which use the gas in soft drinks and fizzy fizz  
intr.v. fizzed, fizz·ing, fizz·es
To make a hissing or bubbling sound; effervesce.

n.
1. A hissing or bubbling sound.

2. Effervescence.

3. An effervescent beverage.
 water. Finally, as a result of a mismatch mismatch

1. in blood transfusions and transplantation immunology, an incompatibility between potential donor and recipient.

2. one or more nucleotides in one of the double strands in a nucleic acid molecule without complementary nucleotides in the same position on the other
 between its production and upgrading plants, Terra produces more ammonia than it can upgrade. Terra, together with Ontario Power Generation Ontario Power Generation (OPG) is a public company whose shares are wholly owned by the Government of Ontario. It is responsible for approximately 70% of the electricity generation in the province of Ontario, Canada [1]. , has found that ammonia's high hydrogen content makes it ideal as a reagent that reduces nitrogen oxide Noun 1. nitrogen oxide - any of several oxides of nitrogen formed by the action of nitric acid on oxidizable materials; present in car exhausts
pollutant - waste matter that contaminates the water or air or soil
 emissions when sprayed into a power plant's exhaust stream.

[FIGURE 1 OMITTED]

The second example is offered by the Cabot Canada, which purchases residual oil residual oil
n.
The low-grade oil products that remain after the distillation of petroleum, used in adhesives, roofing compounds, and asphalt manufacture.

Noun 1.
 feedstock from local oil refineries This is a list of oil refineries. The Oil and Gas Journal also publishes a worldwide list of refineries annually in a country-by-country tabulation that includes for each refinery: location, crude oil daily processing capacity, and the size of each process unit in the refinery.  to produce carbon black. Cabot's carbon black has been used in a myriad of products from tires and plastics to coatings and pigments. Residual oil products that do not meet the quality standards set by Cabot are combusted by other refinery customers to generate electricity and fuel ships, thereby making productive use of residual oil product.

A third pocket of industrial symbiosis occurs at LANXESS, a large manufacturer of rubber polymers and other chemical intermediates. The bulk of LANXESS' feedstocks are co-products from a cracked crude hydrocarbon mixture from which the lighter ethylene and propylene propylene /pro·pyl·ene/ (pro´pi-len) a gaseous hydrocarbon, CH3CHdbondCH2.

propylene glycol  a colorless viscous liquid used as a humectant and solvent in pharmaceutical preparations.
 products have been removed by distillation distillation, process used to separate the substances composing a mixture. It involves a change of state, as of liquid to gas, and subsequent condensation. The process was probably first used in the production of intoxicating beverages. . LANXESS takes the crude C-4 mixture and distills off the butadiene butadiene (byt'ədī`ēn), colorless, gaseous hydrocarbon. There are two structural isomers of butadiene; they differ in the location of the two carbon-carbon double bonds in the , which is sold to other companies as a chemical intermediate for the production of a variety of rubber polymers or plastics. The remainder of the crude C-4 stream is then run through an isomerization process to produce isobutylene Noun 1. isobutylene - used also in making gasoline components
butene, butylene - any of three isomeric hydrocarbons C4H8; all used in making synthetic rubbers

butyl - a hydrocarbon radical (C4H9)
, which LANXESS then uses as a feedstock to manufacture butyl rubber butyl rubber: see rubber. . The balance of the crude is sold as raffinates, which are used as gasoline octane oc·tane  
n.
1. Any of various isomeric paraffin hydrocarbons with the formula C8H18, found in petroleum and used as a fuel and solvent.

2. An octane number.
 enhancers in the petroleum fuel industry.

Finally, Suncor produces ethanol from corn, and generates [CO.sub.2] and distiller grains in the process. The company captures its [CO.sub.2] for Praxair, a provider of industrial gases, for use in the production of soft drinks. Suncor also dries and ships the distiller grains to farms across Southern Ontario where they are fed to cattle. Through this process, Suncor is able to extract their product, ethanol, from the corn, without disrupting its end use in agriculture. In doing so, Suncor counters some of the criticisms in the food versus fuel debate that has circled the issue of using corn for ethanol.

These examples provide a general sense of industrial symbiosis in action. Next, we compare and contrast industrial symbiosis with forward and reverse supply chains, drawing on these examples to illustrate the differences.

Contrasting Conventional Supply Chains with Industrial Symbiosis

Industrial symbiosis and conventional supply chains are both representations of interorganizational relationships based on product flows, but they differ markedly. Although both models recognize the importance of integration and coordination, industrial symbiosis involves a much tighter network of diverse relationships. In Table II we summarize the key differences between industrial symbiosis and conventional supply chains, both at the level of the supply chain system and the level of the individual firm within that system, and describe them in greater detail below.
TABLE II

Contrasting Industrial Symbiosis with Conventional Supply Chain
Approaches

                     Industrial Symbiosis     Forward and Reverse
                                              Supply Chains

System level         Based on norms of        Often dominated by a
Coordination         community and            large, powerful firm,
                     cooperation              and/or competitive
                                              market mechanisms

Idiosyncratic        Supply chain             Supply chain
relationship         relationships take       relationships designed
                     advantage of unique fit  based on need--i.e.,
                     between firms--i.e.,     buys and sells
                     geographic proximity     globally

Firm and flow        Cooperating firms are    Cooperating firms focus
heterogeneity        diverse and drawn from   on delivering a single
Structure            multiple industries A    type of product
                     dense network            Generally, a linear
                     structure, with          structure with multiple
                     interconnecting ties in  suppliers and multiple
                     many directions          customers

Firm level Product   Products produced are    Products produced are
identity Product     independent of a firm's  consistent with a
manufacturing        identity Multiple        firm's identity Single
Strategic logic      products produced from   product produced from a
                     a set of inputs--sold    set of inputs--sold to
                     to multiple industries   a single industry Firms
                     Firms sell products      design and sell
                     that they have--seeking  products to meet
                     a higher value use of    customer needs.
                     waste, byproducts and    Causation logic
                     chemical
                     intermediaries.
                     Effectuation logic

Perception of waste  Waste is seen as         Waste is to be
                     feedstock for other      minimized
                     production processes


A key difference between industrial symbiosis and conventional supply chains is reflected in the coordination mechanisms between firms. Industrial symbiosis emphasizes community, cooperation and connectedness (Ehrenfeld 2000). Symbiotic partners are part of a community that provides a myriad of different mechanisms to connect partners (including trade and volunteer associations, and social clubs), and nurture idiosyncratic id·i·o·syn·cra·sy  
n. pl. id·i·o·syn·cra·sies
1. A structural or behavioral characteristic peculiar to an individual or group.

2. A physiological or temperamental peculiarity.

3.
, mutually beneficial Adj. 1. mutually beneficial - mutually dependent
interdependent, mutualist

dependent - relying on or requiring a person or thing for support, supply, or what is needed; "dependent children"; "dependent on moisture"
 relationships among employees. Thus, organizational members of symbiotic partners have vested interests vested interest
n.
1. Law A right or title, as to present or future possession of an estate, that can be conveyed to another.

2. A fixed right granted to an employee under a pension plan.

3.
 in preserving the symbiotic partnerships that extend beyond economic transactions. Suncor's sustainability vision, for example, supports the local farming community. As a result, the company returns the spent dried distiller grains after the ethanol is extracted to farmers to feed cattle. Suncor extracts value from the supply chain, but does not disrupt it. Typical ethanol producers, on the other hand, use the spent grains to cogenerate electricity, consuming the feed for their own uses.

Conventional supply chains are coordinated through information exchanges, such as orders, forecasts, marketing and inventory information. Consequently members of forward and reverse supply chains fall victim to competitive tactics as each vies for power in the chain. Partners involved in industrial symbiosis, however, are more likely to uncover innovative and mutually beneficial responses to external threats because of the rich information exchanges that come with personal relationships.

As a consequence of this high level of coordination, many of the relationships formed in industrial symbiosis arise out of serendipity serendipity

happy finding of an unexpected object or solution while searching for something else.
 and are somewhat idiosyncratic to the partners. These organizations capitalize on Cap´i`tal`ize on`   

v. t. 1. To turn (an opportunity) to one's advantage; to take advantage of (a situation); to profit from; as, to capitalize on an opponent's mistakes s>.
 the unique opportunities afforded by geographic proximity, excess resources and potentially useful wastes. Colocation is often important for industrial symbiosis because many waste products have short shelf lives, have hazardous properties, are difficult to transport (bulky or toxic) or have such low value that they do not warrant the expense of transporting (such as [CO.sub.2]). Terra Industries, for example, is able to pipe its ammonia solution to nearby Ontario Power Generation, rather than incurring the costs and complexity of granulating the solution in order to transport it further, as would be required of competitors. Conventional supply chains, in contrast, are rarely confined by geography, commonly sourcing raw materials from the least expensive global supplier and selling products internationally (Roth, Tsay, Pullman and Gray 2008).

These opportunistic relationships yield considerable heterogeneity het·er·o·ge·ne·i·ty
n.
The quality or state of being heterogeneous.



heterogeneity

the state of being heterogeneous.
 in terms of organizational characteristics and material flows in symbiotic relationships. Large organizations may partner with small ones because of the small volumes of byproducts. Heavy industry firms may partner with more service-oriented firms. For example, Terra Industries was a large chemical fertilizer plant that produced residual heat and [CO.sub.2]. Enviro-Fresh, a greenhouse operator growing bell peppers, was founded primarily to benefit from these residual products. Conventional supply chains rarely establish these unique waste reuse relationships and thus manage a more homogeneous set of customers and customer relationships.

This high level of coordination and colocation among relatively heterogeneous organizations in industrial symbiosis results in quite a different network structure than for conventional supply chains. Industrial symbiosis results in a dense web of relationships. One firm's customer can also be its supplier or that of its other customers. Consider Terra Industries, which sells nitrogen-based fertilizers to the agricultural industry, and ammonia solutions to the power industry, [CO.sub.2] for a variety of manufacturing purposes and excess heat and steam to a colocated greenhouse operator. Terra's residuals are sold to numerous firms in a variety of industries. The Ontario Power Generation not only supplies Terra electricity, it also uses the ammonia that Terra produces. These relationships result in a branched interorganizational structure that more closely resembles a web than a chain. In contrast, conventional approaches to supply chains focus on forward or backward flows of products that are sold into a relatively homogeneous market. Before establishing interorganizational relationships to sell residual urea solution, heat and [CO.sub.2] Terra's business only served the agricultural industry. Although a network structure exists in both industrial symbiosis and conventional supply chains, the networks are tighter and denser in industrial symbiosis.

In addition to these system-level differences, there exist firm-level differences between symbiotic and conventional approaches to supply chains. Firms engaging in industrial symbiosis identify more strongly with the materials and resources they process, whereas firms in a conventional supply chain identify more closely with the end products. For example, the Cabot Canada has found a myriad of uses for its carbon black materials, including in adhesives, tires, batteries, coatings and printing inks. The firm has been identified with carbon black since the material was invented at the end of the 19th century.

This strong identification to inputs usually implies that firms involved in industrial symbiosis are diversified. They aim to extract as much value from inputs as possible. Firms in conventional supply chains, on the other hand, focus on the output or a single product and do not appear as diversified. Figure 1, for example, illustrates that Terra not only sells its main fertilizer product, but also the residual heat, [CO.sub.2] and ammonia.

The strategic logic of industrial firms in symbiotic relationships also differs from firms in more conventional supply chains. Symbiotic firms are governed by a logic of effectuation ef·fec·tu·ate  
tr.v. ef·fec·tu·at·ed, ef·fec·tu·at·ing, ef·fec·tu·ates
To bring about; effect.



[Medieval Latin effectu
 in which opportunities are created, rather than merely discovered (Sarasvathy 2001). This logic implies that symbiotic firms seek markets based on available manufacturing waste, rather than design and manufacture products to the exacting needs of customers. Firms involved in industrial symbiosis aim to extract value from the raw materials, hoping to find new uses for unused materials. This logic characterizes Terra Industries' search for synergies not only with their symbiotic partners, but more broadly within the petrochemical industry in the region, which are not always immediately apparent. Terra, for example, actively searched for an entrepreneur who could build greenhouses on their land, because there was no obvious business that could use the residual heat and [CO.sub.2]. However, firms in conventional supply chains allow customers to define their needs and work backward to design the product.

Collectively, these factors mean firms involved in industrial symbiosis look for the potential value that lies in a resource. Firms minimize waste by extracting value from the entire resource. At LANXESS this potential value is so firmly ingrained that all of the crude C-4s are refined and either sold or used productively thereby eliminating wastes. Chemicals like butadiene, which cannot be used in the manufacture of LANXESS' products, are sold as a chemical intermediate. Consequently, waste is minimized for the system of organizations, even though it may not be minimized for a single organization. Firms in conventional supply chains, on the other hand, see the risks or costs in their waste products and thus aim to reduce waste within each organization.

Typically, each member of a conventional supply chain aims to minimize waste. Without waste or by products, however, the rich relationships that comprise industrial symbiosis cannot occur (Olden old·en  
adj.
Of, relating to, or belonging to time long past; old or ancient: olden days.



[Middle English : old, old; see old + -en, adj.
 burg and Geiser 1997; Chertow 2000). Pollution prevention by individual firms in a supply chain can be counterproductive coun·ter·pro·duc·tive  
adj.
Tending to hinder rather than serve one's purpose: "Violation of the court order would be counterproductive" Philip H. Lee.
 to industrial symbiosis, since manufacturing waste may be below reusable levels (Oldenburg and Geiser 1997; Chertow 2000). Government regulations that prohibit or limit handling or transporting waste, as in the case of conventional supply chains, can also inhibit industrial symbiosis (Oldenburg and Geiser 1997). In the next section we illustrate that the focus on the system of firms in industrial symbiosis offers the added benefit of supporting social equity and economic prosperity, and forms the foundation of sustainable development.

THE SUSTAINABILITY OF INDUSTRIAL SYMBIOSIS

Sustainable Development

The World Commission on Environment and Development defined sustainable development in 1987 as "development that meets the needs of the present without compromising the ability of future generations to meet their own needs" (WCED WCED World Commission on Environment and Development
WCED Western Cape Education Department (Zambia)
WCED Wadhwani Centre for Entrepreneurial Development (India)
WCED Wake County Economic Development
 1987, p. 43). Three principles or pillars have emerged to guide sustainability research and practice: environmental integrity, social equity and economic prosperity (Elkington 1998). Environmental integrity guards against excessive consumption and resource depletion Resource depletion is an economic term referring to the exhaustion of raw materials within a region. Resources are commonly divided between renewable resources and non-renewable resources.  in order to maintain the capacity of the earth's ecosystems to provide for human needs. Social equity ensures that all people, including underprivileged people and future generations, are afforded equal opportunities. Economic prosperity acknowledges that in order to provide a reasonable quality of life, goods and services In economics, economic output is divided into physical goods and intangible services. Consumption of goods and services is assumed to produce utility (unless the "good" is a "bad"). It is often used when referring to a Goods and Services Tax.  need to be produced and distributed effectively and efficiently (Bansal 2005).

These three pillars are interconnected. Economic prosperity can be secured by privileging the needs of a small group over the broader society's needs, but this undermines social equity. Economic prosperity can also compromise environmental integrity by quickly consuming natural resources in order to generate higher short-term profits. However, it is possible to construct win-win-win practices that support all three pillars.

The supply chain literature has focused most of its attention on the environmental dimensions of this definition. The emphasis has been on the reduction of wastes through pollution control and pollution prevention pollution control captures, controls and treats pollution at the end of the pipe (Vachon and Klassen 2007): firms aim to clean up the mess created by manufacturing processes. Pollution prevention, on the other hand, tackles pollution at the source, before it is created, through product and process redesign (Klassen and Why bark 1999). In each of these cases, waste is treated as pollution, something to be avoided or eliminated. More recently, some supply chain researchers have acknowledged the residual value associated with waste (Linton, Klassen and Jayaraman 2007).

Industrial symbiosis is important for sustainability, not only because of how wastes are handled, but also because it addresses the social and economic aspects of sustainability. In fact, industrial symbiosis has been hailed as the "Science of Sustainability" (Allenby 1999). In part this is because the ecosystem upon which industrial symbiosis is modeled is considered sustainable (Korhonen 2001). Some scholars go even further, touting industrial symbiosis as the model that advances the sustainability paradigm (Ehrenfeld 2000). Industrial symbiosis produces environmental integrity, social equity and economic prosperity simultaneously.

Industrial symbiosis maintains environmental integrity by minimizing the industrial system's ecological footprint Ecological footprint (EF) analysis measures human demand on nature. It compares human consumption of natural resources with planet Earth's ecological capacity to regenerate them.  through three mechanisms: the productive use of waste, high resource intensity and accelerated biological degrading processes.

Waste is low because industrial symbiosis captures residual flows, thereby emitting little waste and imposing little strain on nature's "sinks" (Huber 2000). Sinks are nature's mechanism for absorbing high concentrations of materials from discarded consumer products, manufacturing pollution and even [CO.sub.2] and residual heat (Ster-man 2002). For example, Terra Industries redirects significant amounts of [CO.sub.2] and low-grade waste heat from the atmosphere to Enviro-Fresh, a colocated greenhouse. The vegetables effectively sequester sequester v. to keep separate or apart. In so-called "high-profile" criminal prosecutions (involving major crimes, events, or persons given wide publicity) the jury is sometimes "sequestered" in a hotel without access to news media, the general public or their  [CO.sub.2], reducing carbon emissions that contribute to climate change, while simultaneously increasing the greenhouse's efficiency. This relationship also reduces the amount of energy Enviro-Fresh draws from the grid.

Similarly, industrial symbiosis increases resource intensity, enabling partner firms to extract greater value from existing resources. Intensity is increased as partner firms replace virgin resource streams with residual waste streams. Firms engaged in industrial symbiosis extract fewer resources from and emit less waste to the natural environment. Therefore, nature's resources are reused multiple times before disposal. Suncor, for example, captures its own [CO.sub.2] and sells the gas to Praxair for compression into dry ice and use in soft drinks.

Finally, industrial symbiosis accelerates the biological degradation of waste, which decreases the concentrations and toxicity of the emissions in natural systems. Industrial partners in symbiotic relationships simulate the role of natural scavengers, which decompose de·com·pose  
v. de·com·posed, de·com·pos·ing, de·com·pos·es

v.tr.
1. To separate into components or basic elements.

2. To cause to rot.

v.intr.
1.
 dead vegetation or animals, returning nutrients to the earth. For example, Cabot Canada breaks down residual oil feedstock into carbon black and a variety of gases including nitrogen oxide, carbon monoxide carbon monoxide, chemical compound, CO, a colorless, odorless, tasteless, extremely poisonous gas that is less dense than air under ordinary conditions. It is very slightly soluble in water and burns in air with a characteristic blue flame, producing carbon dioxide;  and [CO.sub.2]. Although these gases may have an impact on natural systems, they are less harmful than residual oil feedstock.

Industrial symbiosis also enhances the social equity within communities. As we argued earlier, industrial symbiosis fosters strong social and professional relationships between members of the business community, like those developed in the Sarnia-Lambton region. Industrial symbiosis encourages a shared sense of community that engenders a collaborative, positive response to adversity. Firms in symbiotic relationships embed themselves in the local community, fostering a more responsible orientation (Granovetter 1985). While conventional supply chains typically transact with only two types of actors (suppliers and customers), firms involved in industrial symbiosis engage in many different types of relationships, forming a dense network of interdependent firms. Partners come to rely on each other, investing in capital-intensive, relationship-specific assets, such as pipelines and [CO.sub.2] capture technologies. As a result, under adversity, partners are more likely to solve problems collaboratively and innovatively, since it is in the collective interest to sustain the relationship.

Further, economic wealth generated from local natural resources is retained within the local community, which is in sharp contrast to global supply chains where the lenders, employees and consumers are geographically removed (Roth et al. 2008). Firms involved in industrial symbiosis capture economic rents from local industrial activity, and the rents ultimately flow to the communities that steward those natural resources. This stewardship has a direct and positive effect on the firms reducing the pollution, which in turn enhances social equity through decreased risk to human health from toxic emissions. In fact the Sarnia-Lambton region is starting to shake off its long-held moniker (1) A name, title or alias. See alias.

(2) A COM object that is used to create instances of other objects. Monikers save programmers time when coding various types of COM-based functions such as linking one document to another (OLE). See COM and OLE.
 of "chemical valley" from the petrochemical days, in no small part due to the symbiotic activities in the region. The toxins and waste products entering the local air, water and land have been dramatically reduced.

Industrial symbiosis also helps to build economic prosperity. Firms generate revenues from resources that would otherwise be discarded, such as the revenue generated by the oil refinery that sold its residual oil as feedstock to Cabot Canada. Further, waste disposal and clean-up costs are mitigated. The volume and toxicity of many wastes--such as residual oil feedstock, off specification carbon black and bulky dried distiller grains--makes them costly to dispose because they require significant remediation, transportation, tipping fees and containment.

In summary, industrial symbiosis supports the three pillars of sustainable development. From the above discussion, we argue that industrial symbiosis is a sustainable approach to economic development, one upon which future generations can rely.

IMPLEMENTING INDUSTRIAL SYMBIOSIS

The Challenges of Implementing Industrial Symbiosis

The high degree of community, cooperation and coordination demanded of industrial symbiosis is hard to achieve. There are both technical and social challenges. The two major technical challenges pertain to pertain to
verb relate to, concern, refer to, regard, be part of, belong to, apply to, bear on, befit, be relevant to, be appropriate to, appertain to
 the quantity and appropriate quality of industrial byproducts. The social challenges arise from the need to trust partner firms to meet those quantity needs and quality standards. We discuss each in turn.

Firms must ensure that adequate supply of their byproducts be provided to symbiotic partners. However, the quantity of the byproducts is determined by the demand for the core products. Further, the production processes of many firms require inputs that conform to Verb 1. conform to - satisfy a condition or restriction; "Does this paper meet the requirements for the degree?"
fit, meet

coordinate - be co-ordinated; "These activities coordinate well"
 exacting quality standards. However, because firms focus most of their attention on their core product, the quality of their byproducts can be compromised. Wide quality variance can inhibit the success of many manufacturing processes (Cohen-Rosenthal 2000; Heeres et al. 2004). For example, Terra Industries' residual steam is not hot enough for most uses, and its residual [CO.sub.2] is impure im·pure  
adj. im·pur·er, im·pur·est
1. Not pure or clean; contaminated.

2. Not purified by religious rite; unclean.

3. Immoral or sinful: impure thoughts.
 because it is blended with air. Enviro-Fresh greenhouses offer one of the few productive uses of these wastes.

Implementing industrial symbiosis also carries social challenges associated with the personal relationships that are at its very core (Cohen-Rosenthal 2000; Hoffman 2003; Seuring 2004; Boons and Howard-Grenville, forthcoming). Industrial symbiosis requires trust and cooperation among its diverse partners (Chertow 2000). Managers must know their respective partners and consider their mutual interests in production decisions that could influence the supply of byproducts used by the industrial symbiosis network. Although, on the one hand, the diverse relationships afford flexibility, on the other, they can also become a liability. The relationships can become embedded, and inhibit adaptation and innovation to externally driven opportunities and challenges. Relationship-specific assets and contracts oblige firms to provide customers and partner firms a prescribed volume of byproducts. Yet, meeting these demands can be challenging.

These restrictions limit the ability of the symbiotic system to respond to shocks. For example, if the demand for fertilizer decreased, Terra Industries could idle a portion of its operations, but this would reduce the quantity of [CO.sub.2] steam and ammonia solution produced, which would have a knock-on effect on Air Liquide, Enviro-Fresh and Ontario Power Generation. At the very least, these rigidities impose additional costs, as the recipient firms will have to source inputs from elsewhere. At the worst, the failure of one company could cause reverberations through the system, leading to a collapse of the symbiotic relationships.

Not only must managers monitor their own market, but they must also keep abreast Verb 1. keep abreast - keep informed; "He kept up on his country's foreign policies"
keep up, follow

trace, follow - follow, discover, or ascertain the course of development of something; "We must follow closely the economic development is Cuba" ; "trace the
 of their supply partners' markets. For example, the managers at Terra Industries were faced with significant challenges in retooling their marketing and sales force in order to sell urea solution to the power generation and diesel engine markets--both markets for which they had little information. Managing these customers, in addition to the agricultural firms to which they were accustomed, raised challenges. Learning about and catering to each new market consumes valuable managerial attention, making it difficult to react quickly to downstream product changes.

OVERCOMING THE CHALLENGES OF IMPLEMENTING INDUSTRIAL SYMBIOSIS

Strong communities among diverse firms and industries are critical to industrial symbiosis. That is why research on industrial symbiosis focuses on industrial parks (Cote and Hall 1995; Chertow 2007). Industrial parks possess the physical infrastructure for sharing materials, as well as social structures for facilitating collaborations. When communities possess a diverse industrial base, a simple meeting can spark the creativity, courage and commitment to initiate a symbiotic relationship symbiotic relationship (sim´bīot´ik),
n in implantology, that relationship assumed by an implant and the natural teeth to which it has been splinted.
. The Sarnia-Lambton region, for example, not only possessed the physical infrastructure (such as pipelines and a dense array of plants that remained from a largely depleted de·plete  
tr.v. de·plet·ed, de·plet·ing, de·pletes
To decrease the fullness of; use up or empty out.



[Latin d
 petrochemical industry) that facilitated the transfer of volatile byproducts, but also the social structures (such as professional associations and golf clubs) that facilitated personal relationships.

Equally important is trust among potential partners (Gibbs 2003). Third parties such as government, industry associations and other coordinating organizations can help to build trust. These organizations can facilitate information sharing See data conferencing.  (Heeres et al. 2004), broker relationships (Paquin and Howard-Grenville, forthcoming), champion shared services shared services,
n.pl the administrative, clinical, or other service functions that are common to two or more hospitals or their health care facilities and used jointly or cooperatively by them.
 (van Beers et al. 2007) and serve as anchor organizations (Chertow 2000).

Once trust is established, it is important to share critical processes and data regarding each other's operations. If manufacturing processes are well understood and manufacturing waste readily apparent, less data need to be shared. In addition, information brokers can be particularly useful in performing vital matchmaking Matchmaking
Matricide (See MURDER.)

Kecal

marriage broker whose plans are foiled by a pair of lovers. [Czech Opera: Smetana The Bartered Bride in Osborne Opera, 32]

Levi, Dolly
 services (Mirata 2004).

Industrial symbiosis is more likely when mutually beneficial relationships that align the interests of all parties are formed. For example, a proposal to colocate a greenhouse beside an oil refinery may be more interesting to the oil refinery if the greenhouse produced bio-fuels that the oil refinery could process and sell. The mutual benefit that results becomes truly symbiotic, and not merely the sinking of one firm's waste into another's production processes.

These technical and social challenges are not insignificant. In fact, we know of no perfect symbiotic system of firms in which all wastes are internalized within the system and completely consumed. Even Kalundborg, the most cited example of industrial symbiosis, still generates wastes through its member firms' production processes. Consequently, most firms do not rely on a pure symbiotic model, but a hybrid form that integrates industrial symbiosis with forward and reverse supply chains. A hybrid model is based on a conventional supply chain, but incorporates elements of industrial symbiosis. The most elementary example of a hybrid supply chain is where the wastes of one firm are used as inputs for another firm's processes, in exchange for money. This rather minimal form of industrial symbiosis helps to contain the level of complexity that comes with interdependence. In fact, hybrid models may be able to achieve many of the benefits associated with industrial symbiosis, without compromising the resiliency associated with the rigidity and inflexibility of industrial symbiosis.

CONCLUSION

In this paper, we explored the sustainability of industrial symbiosis, a specific form of supply chain. We did this first by contrasting how industrial symbiosis differs from a more conventional view of supply chains. We argued that industrial symbiosis offers a model of sustainable development because of its emphasis on system-level waste reduction opportunities. Such a perspective demands tight integration, coordination and trust among partners, which in turn serves to build environmental integrity, social equity and economic prosperity within the region. We also identified some of the challenges associated with industrial symbiosis and offered some suggestions on how these challenges might be overcome. Our insights were drawn from an analysis of symbiotic activities in the Sarnia-Lambton region of Ontario, Canada.

This analysis makes an important contribution to the supply chain literature by clearly articulating the differences between the two different types of interorganizational relationships. Within conventional supply chains, new products move forward and end-of-life products move in reverse, whereas within industrial symbiosis, partnerships are created from the flow of byproducts. Industrial symbiosis has had little influence in the supply chain literature to date and yet there is considerable opportunity to learn about the nature of these relationships. Industrial symbiosis offers an opportunity to extend beyond pollution control and pollution prevention, and recognize the economic, social and environmental value in using waste within a system of organizations. It demonstrates the importance of considering the whole system of organizations in assessing sustainability (Choi, Dooley and Rungtusanatham 2001).

Globalization globalization

Process by which the experience of everyday life, marked by the diffusion of commodities and ideas, is becoming standardized around the world. Factors that have contributed to globalization include increasingly sophisticated communications and transportation
 has been extending the reach of supply chains, so that producers and consumers are becoming ever more distant (Roth et al. 2008). Alongside is the push for standardization to further enable firms to work together. Both of these trends are in sharp contrast to the geographical colocation and diversity demanded by industrial symbiosis. If sustainable development is to be a business mandate, then it is incumbent on businesses to recognize the importance and relevance of geographical proximity and diversity (Heeres et al 2004; Roberts 2004; Gibbs and Deutz 2007).

In this paper, we also sounded a cautionary note. Industrial symbiosis is a challenging undertaking. Managers must recognize that industrial symbiosis heightens the degree of interdependence and complexity between partner firms, which increases the level of risk, if not managed carefully. Firms must manage these types of interdependences, establishing coordinating mechanisms that help the system absorb exogenous Exogenous

Describes facts outside the control of the firm. Converse of endogenous.
 and endogenous endogenous /en·dog·e·nous/ (en-doj´e-nus) produced within or caused by factors within the organism.

en·dog·e·nous
adj.
1. Originating or produced within an organism, tissue, or cell.
 shocks.

This research points to the economic, environmental and social opportunities created by waste. It suggests that firms not only add value to resources along a supply chain, but can also extract more value from byproducts, intermediates and other residuals. By looking to industrial symbiosis, supply chain research can facilitate a set of interorganizational partnerships that could lead to greater sustainable development.

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Acknowledgments: The authors would like to thank Robert D. Klassen, who provided guidance on previous drafts. We would also like to thank Mary Prendiville, who assisted with the interviews. The order of authors is alphabetic, as the contribution was equal

(1) The U.S. municipal solid waste industry alone generates more than US$50 billion in revenues, of which between 35 percent and 45 percent is estimated to come from commercial sources.

PRATIMA BANSAL AND BRENT MCKNIGHT

Univeristy of Western Ontario

Pratima Bansal (D.Phil., University of Oxford) currently holds the position of professor at the University of Western Ontario Western is one of Canada's leading universities, ranked #1 in the Globe and Mail University Report Card 2005 for overall quality of education.[2] It ranked #3 among medical-doctoral level universities according to Maclean's Magazine 2005 University Rankings.  in London, Ontario, Canada. She is also Director of the Richard Ivey Business School's Centre on Building Sustainable Value Sustainable Value

Sustainable Value is an approach to measure and manage sustainability performance. The concept was developed by researchers who are working today for Queen's University Belfast
, and the Executive Director of the Research Network for Business Sustainability. Dr. Bansal was awarded the Aspen aspen, in botany
aspen: see willow.
Aspen, city, United States
Aspen (ăs`pən), city (1990 pop. 5,049), alt. 7,850 ft (2,390 m), seat of Pitkin co., S central Colo.
 Institute's title of "Faculty Pioneer for Academic Leadership" in 2008. Her research is focused on the relationship between business sustainability and business strategy. She has written a book ("Business and the Natural Environment") as well as articles published in journals that include the Academy of Management Journal, Organization Science and the Strategic Management Journal. The results of her research also have appeared in such popular press outlets as the Wall Street Journal, the National Post, Globe and Mail and The Independent.

Brent McKnight (M.B.A., McMaster University McMaster University, at Hamilton, Ont., Canada; nondenominational; founded 1887. It has faculties of humanities, science, social sciences, business, engineering, and health sciences, as well as a school of graduate studies and a divinity college. ) is a Ph.D. candidate at the University of Western Ontario's Richard Ivey School of Business in London, Ontario, Canada. His current research is focused on strategy and business sustainability, and his wider research interests include industrial ecology, organizational and system resilience and corporate social performance.
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Author:Bansal, Pratima; McKnight, Brent
Publication:Journal of Supply Chain Management
Article Type:Report
Date:Sep 22, 2009
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