Implications of raising cigarette excise taxes in Peru/Efectos de aumentar los impuestos indirectos sobre tabaco en el Peru.
However, raising cigarette taxes can also have bad consequences: it can be regressive, meaning that the poor will pay a higher percentage of their income to cover the tax than the rich will. Regressivity is an important topic because the tobacco industry frequently uses this argument to oppose government policy that might raise taxes to reduce consumption.
In most nations, the poor smoke more than the rich do (3). As a result, the poor often spend a substantially larger proportion of their income on cigarettes, bearing a disproportionate share of the cigarette tax burden. Therefore, increasing the tax disproportionately increases this burden (4-6). A tax increase may not be regressive if the poor are much more sensitive to the price change than the rich are and they respond by quitting smoking or reducing consumption. In this scenario, the change in tax expenditure for the poor would be less than for the rich. Therefore, if the poor have a much larger demand price elasticity,  in absolute value, then an increase in cigarette taxes would not be regressive.
How much a tax increase reduces consumption and whether or not it is regressive are important empirical questions. One can design effective public policy to reduce tobacco consumption by taking into account the answers to these questions.
The objectives of this study were to empirically assess how raising cigarette taxes would impact consumption in Peru and to determine whether or not an increase would be regressive.
MATERIALS AND METHODS
Two distinct datasets were used for estimating cigarette demand in Peru. The first was a time-series database composed of quarterly data from 1993-2012. It provided information on apparent consumption, average real price of cigarettes, and the average monthly income per rolling quarter reported by the National Institute of Statistics and Informatics (INEI) of Peru (7). The second dataset came from the ENAPREF 2008-2009 (8), a household survey of income and expenditure that includes cigarette expenses and quantities purchase by individuals in a household.
The consumption of cigarettes variable was constructed from the macroeconomic identity that takes cigarette production and adds to it the cigarette imports and subtracts the cigarette exports (called apparent consumption) using the data records of the Superintendencia Nacional de Aduanas y de Administracion Tributaria (National Customs and Taxation Authority). Since 2005, the demand for cigarettes in Peru has been satisfied mainly by imports from Chile, where British American Tobacco Chile Operaciones S.A. (Santiago, Chile) has its production plant.
The source of the cigarette price series was the consumer price index (CPI), with the real price of cigarettes computed by dividing the CPI of cigarettes by the general CPI as per the INEI (7). These monthly statistics were then converted to quarterly figures to compute the average real price per quarter.
For the series of income, the average monthly income per mobile quarter reported by INEI in its Permanent Employment Survey (9) was used. This nominal income was transformed in real terms using the general CPI.
Given the tobacco market in Peru, where cigarette demand is supplied by imports, it was necessary to include the exchange rate as a control variable in the demand function for cigarettes. The quarterly series used in this work corresponds to the average interbank exchange rate (sell) of the Central Reserve Bank of Peru, from the first quarter of 1993 to the last quarter of 2012.
The average quarterly consumption was about 35 packs of 20 cigarettes, ranging from a low of 14 packs to a high of 63. The real price in Peruvian Nuevos Soles (PEN) varied from PEN 1.00-1.75, with the real median price of PEN 1.45 over the whole sample. Note that this price was computed as a ratio of two price indices (cigarette price index divided by consumer price index) that do not have an interpretation regarding the Peruvian currency. The monthly average real income in the sample was around PEN 1 600 (US$ 540), ranging from nearly PEN 1 200-2 000 (US$ 405 676). The average exchange rate in the sample was PEN 2.96 : US$ 1.00, and ranged from PEN 1.76-3.50.
The ENAPFRE has a module that collects data on individual spending on cigarettes. It quantifies cigarette spending per person in a household, but does not identify the smokers. So, for example, it is possible that the person who purchases the cigarettes is not the smoker. In this regard, the survey can be used to characterize the percentage of households with at least one smoker. Of the 35 000 households in the survey, a little less than 8% had at least one smoker.
The unit value was computed as the ratio between expenditure on cigarettes and physical quantities bought. The estimation of the demand for cigarettes was performed in two ways, using the quantity of cigarettes purchased by each and the unit value of every purchase. This same information was aggregated for the household level. The methodology advanced by Deaton (10) was employed.
To measure the sensitivity of the cigarette demand to a price change, individuals who reported any spending on cigarettes and who received income during the reference period of the survey were selected. A total of 3 642 people reported having purchased cigarettes during the reference week, but of those only 3 153 also reported some income. Therefore, estimations were performed using this latter group, of which 95% was male and the level of education was 14% primary school, 66% secondary school, and 20% a college degree.
Specifying cigarette demand using time series data
Specifying a conventional demand function for cigarettes requires stationarity of the individual variables involved. If not, then the specification of the demand function depends on whether the variables contain a common trend or not. For a complete description of the functional form of the demand for cigarettes, tests, and estimation procedures with time series data, see Gonzalez-Rozada (11).
The order of integration for each variable was identified using the Augmented Dickey-Fuller test (ADF) (12). The ADF statistic suggests that the apparent consumption of cigarettes, the average real price, the average real income, and the exchange rate are individually non-stationary variables. The Johansen test procedure (13-16) was used to check for cointegration between these series. The result of Johansen's sequential procedure suggests that there is a cointegration relationship between the mentioned variables during the period under analysis. The specification of the demand for cigarettes, in the long run, was established by a model for the steady-state path growth of the variables.
Demand price elasticity ([[lambda].sub.1]) states that a 1% increase in the real price of cigarettes reduces consumption by [[lambda].sub.1]%, while the income elasticity ([[lambda].sub.2]) indicates that a 1% increase in a consumer's real income increases the amount consumed by [[lambda].sub.2]% in the long run. In the short-run, the variables may not be in the path of long-run equilibrium; therefore, a general model was specified that allowed the estimation of the short-run elasticities of cigarette consumption.
The demand price elasticity for the short-term ([[beta].sub.0]) states that a 1% increase in price causes a drop of [[beta].sub.0]% in the number of cigarettes consumed in a quarter, while the short-term income elasticity ([[gamma].sub.0]) indicates that an increase of 1% in real income of consumers produces an increase of [[gamma].sub.0]% in the number of cigarettes consumed in a quarter.
Specifying cigarettes demand using cross-sectional data
Household surveys, such as ENAPREF, do not report the price of cigarettes. The ENAPREF asks households to report not only their spending on each good, but also the physical quantity purchased. The ratio of these two figures is a measure of price, or more accurately, a unit value. One reason the unit values are not the same as the prices is that unit values are affected by the level of quality of the product purchased. For example, in the case of a pack of cigarettes, a premium brand costs more than a pack of black market ones since, in general, smuggled cigarettes are of lower quality. The unit values include this quality feature. Unit values were computed by dividing the expenditure by the physical quantities so that premium cigarettes have higher unit values. As a result, and in contrast to a market price on which the consumer has no control, in this case the consumer "chooses" a unit value, at least to some extent. In particular, since richer households tend to buy higher quality products, unit values are positively related to income.
The basic ideas underlying the model that allows this estimation can be found in the work of Deaton (10). A more detailed explanation of the procedures necessary for price estimation and income elasticity are explored elsewhere by Ramos-Carbajales and colleagues (17).
A demand price elasticity of -0.7 was found in Peru, implying that increasing prices by 10%, via taxes, reduces consumption by 7%. Demand price elasticity estimations by income groups suggested that poorer families are not more price sensitive than richer ones, implying that increasing cigarette taxes in Peru could be regressive.
Some of the characteristics of both datasets--time series and cross-sectional--follow. Figure 1 shows the evolution of the apparent consumption of cigarettes measured in millions of packs of 20 cigarettes per quarter. Apparent consumption was highly volatile in these estimations, as expected, due to abrupt changes made in imports/exports made by importers, decisions not necessarily tied directly to cigarette smoking. It is important to reiterate that during the study period (and presently), there was no national tobacco industry in Peru.
Table 1 summarizes the main sociodemographic characteristics of the population in the ENAPREF survey used to estimate the sensitivity of cigarette demand to price change. In the average household, there were four people older than 13 years of age who had purchased an average of two cigarettes during the survey's reference week. Variability is large, showing some households purchasing up to 34 cigarettes in the reference week.
Time series estimation results
Table 2 reports that the long-run demand price elasticity of cigarette consumption in Peru was -0.689 (P = 0.06), while the long-run income elasticity of cigarette consumption was 0.658 (P = 0.06). With these figures, a 10% increase in real price reduces total cigarette consumption in the long run 6.9%, and a 10% increase in real income increases total consumption of cigarettes in the long run by 6.6%.
The results presented here are similar to those of other time-series studies of countries in the Region of the Americas (11, 17-21). Cigarette demand is inelastic to price and income, however, the demand price elasticity is a bit larger in absolute value than the income elasticity. That is, with a growing economy and, therefore, increasing real income among the population, a more than proportional increase in the real price is not required to cause a drop in cigarette demand.
Cross-sectional estimation results
Table 3 presents estimations of the total demand price elasticity evaluated for the average per-capita household income and the same elasticity by terciles of per-capita household income. The estimations included the following control variables: proportion of women over 18 years of age in the household, the proportion of individuals with a university education in the household, and dummy variables for the location of the houses.
The first tercile corresponds to the group of families with the highest per-capita spending, and the third tercile to those with the lowest. Per-capita spending is a good approximation of per-capita household income, and it follows that the first tercile is composed of the richest households and the third tercile, the poorest.
Table 3 shows an average demand price elasticity of -0.738 (P = 0.01) and an income elasticity of 0.112 (P = 0.01). The income elasticity shown by this study appears to be lower in magnitude than that found in the literature. The demand price elasticity is similar to what was found through the time series estimation. The demand price elasticity by terciles of per-capita household income shows an increasing trend. As per-capita income increases, the demand price elasticity was larger in absolute value. This evidence suggests that richer households were more sensitive to price changes than the poorest ones, contrary to what has been assumed and found in the literature for developed countries (18). If unit values are a good approximation of cigarettes prices, these estimates suggest that an increase in cigarette taxes could be regressive.
To see if the unit values are a good approximation for prices, demand price elasticity was estimated according to Deaton's methodology (10). Estimations were performed using households and individuals as the unit of analysis. Both estimations included control variables. Among the variables associated with the household were the number of people in the household and the proportion of males and females older than 18 years of age. Included among the variables related to the individual were the age of the head of household and age squared, and a set of categorical variables indicating gender and whether university or secondary school education had been attained.
Table 4 shows the estimates of the demand price elasticity, the total expenditure elasticity with respect to the number of cigarettes consumed, and the total expenditure elasticity with respect to the unit value. The demand price elasticity for the total sample ranged from -0.675 to -0.800 (P = 0.01). These values were similar to both the demand price elasticity estimated assuming that unit values reflect prices, and the one that was estimated using time series data. This evidence generates a certain robustness for the study results. If the breakdown by terciles of per-capita household expenditure is considered, the picture is similar to the one presented above. This evidence seems to suggest that poorer households (or lower per-capita expenditure) do not have a larger elasticity in absolute value than households in the first tercile. Thus, tax increases on the consumption of cigarettes in Peru are very likely to be regressive in the sense that the increased tax burden would fall on the shoulders of poor more so than on the rich.
The elasticity of total expenditure is between 0.19-0.22 (P = 0.01), suggesting that a 10% increase in total spending increases cigarette consumption by approximately 2%. The estimate of the quality elasticity with respect to the total expenditure is about 0.09 (P = 0.01). Both panels of Table 4 show that the quality elasticity is statistically significant for those with the lowest total household expenditure per capita. This result is expected since when total expenditure decreases, the expectation is that the poor are more inclined to reduce quality.
This study sought to answer two empirical questions: How much does raising the price of cigarettes through taxes reduce consumption and would an increase in cigarette taxes be regressive?
Increasing cigarette taxes is important public policy for reducing tobacco use. The appeal of increasing cigarette taxes is obvious. Since smoking is bad for one's health and for the health of others, increasing taxes can induce people to quit or cut back.
Using two information sets, we estimated the total demand price elasticity to be -0.7, implying that a 10% increase in the price of cigarettes would reduce consumption by 7%. Since 14 January 2010, Peru has had a specific Selective Consumption Tax of PEN 0.07 per unit of imported cigarette (Supreme Decree 004-2010-EF), that is, PEN 1.40 per pack of 20. Hence, to increase the retail price of cigarettes, this selective tax should be raised, and the total demand price elasticity estimate provides an answer to how much cigarette consumption would be reduced. For the regressivity question, we used the cross-sectional database and estimated the demand price elasticity by income and expenditure groups. We found that, in absolute value, the demand price elasticity of cigarettes is larger for richer households than for poorer ones. This finding suggests that poorer families are not more price sensitive than richer ones, which implies that increasing cigarette taxes could be regressive.
This study had some limitations. The time-series analyses considered apparent consumption, which is highly volatile due to sudden changes made by importers that might be completely unrelated to cigarette smoking. The cross-sectional ENAPREF survey did not permit analysis of certain groups by gender or geographic area, which could be relevant. In spite of these limitations and potential biases, the similarities among the time series and cross sectional results suggest that the estimations were robust.
Evidence found by this study suggests that implementing an effective policy of increasing taxes to reduce consumption should be complemented by public health policies targeted at the poor. Such policies would aim to reduce the adverse effects of spending a larger percentage of their income on the cigarette excise tax.
Acknowledgements. The authors gratefully acknowledge the International Development Research Centre (Ottawa, Canada) and its funding for this project.
Conflict of interests. None declared.
Disclaimer. Authors hold sole responsibility for the views expressed in the manuscript, which may not necessarily reflect the opinion or policy of the RPSP/ PAJPH and/or PAHO.
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Manuscript received on 3 December 2015. Revised version accepted for publication on 25 April 2016.
Martin Gonzalez-Rozada  and Alejandro Ramos-Carbajales 
 Universidad Torcuato Di Tella, Buenos Aires, Argentina. Send correspondence to Martin Gonzalez-Rozada, email: email@example.com
 Interamerican Heart Foundation, Montevideo, Uruguay.
 "Price elasticity" measures the sensitivity of consumption to price changes. If cigarette prices increase, the price elasticity indicates how much consumption will decrease.
Caption: FIGURE 1. Apparent consumption of cigarettes, Peru, 1993-2012
TABLE 1. Sociodemographic characteristics of study sample from the National Survey of Family Budgets (Encuesta Nacional de Presupuestos Familiares) Peru, 2008-2009 Age Number of Average quantity persons > of single 14 years of cigarettes age in the purchased household Average 36.2 3.9 2.03 Median 33.0 4.0 1.14 Standard deviation 13.7 1.7 2.87 Minimum 14.0 2.0 0.15 Maximum 88.0 14.0 34.20 Source: Produced by the authors from the survey data. TABLE 2. Long run price and income elasticity of cigarette demand using quarterly data, Peru, 1993-2012 Variable Dependent variable: Ln (a) (consumption of cigarettes) Coefficient Standard error Ln (real cigarette prices) -0.689 0.321 Ln (real income) 0.658 0.345 Ln (exchange rate) 1.459 0.207 Intercept -2.722 2.513 Seasonal controls Yes Yes Adjusted R-squared 0.5104 F-statistic 42.0724 P-value 0.000 Variable T-statistic P-value Ln (real cigarette prices) -2.144 0.035 Ln (real income) 1.907 0.060 Ln (exchange rate) 7.056 0.000 Intercept -1.083 0.282 Seasonal controls Yes Yes Adjusted R-squared F-statistic P-value Source: Produced by the authors from the study data. Note: Least squares estimations. The table shows heteroskedasticity robust standard errors. (a) Natural logarithm. TABLE 3. Average price and income elasticity estimations from the Encuesta Nacional de Presupuestos Familiares (National Survey of Family Budgets) Peru, 2008-2009 Demand price elasticity, tercile 1 (richer) -0.831 (a) (0.00048) Demand price elasticity, tercile 2 -0.762 (a) (0.00038) Demand price elasticity, tercile 3 (poorer) -0.619 (a) (0.00125) Total demand price elasticity -0.738 (a) (0.0010) Income elasticity 0.112 (a) (0.00152) Source: Produced by the authors from the study data. Note: Figures in parentheses are standard errors computed using the Delta method. (a) P = 1%. TABLE 4. Cigarette demand price elasticity and household total expenditure from the sample taken from the Encuesta Nacional de Presupuestos Familiares (National Survey of Family Budgets) Peru, 2008-2009 Terciles of per capita expenditure Total First Second Estimations by individuals Demand price elasticity -0.800 (a) -0.870 (a) -0.760 (a) (0.198) (0.160) (0.130) Total expenditure elasticity 0.190 (a) 0.240 (a) 0.237 (a) (0.030) (0.070) (0.080) Expenditure elasticity of 0.090 (a) 0.090 (b) 0.006 quality (0.018) (0.050) (0.050) Estimations by households Demand price elasticity -0.675 (a) -0.810 (a) -0.570 (a) (0.212) (0.142) (0.068) Total expenditure elasticity 0.218 (a) 0.250 (c) 0.170 (0.030) (0.100) (0.230) Expenditure elasticity of 0.088 (a) 0.013 0.130 quality (0.018) (0.060) (0.110) Terciles of per capita expenditure Total Third Estimations by individuals Demand price elasticity -0.800 (a) -0.900 (a) (0.198) (0.120) Total expenditure elasticity 0.190 (a) 0.215 (a) (0.030) (0.060) Expenditure elasticity of 0.090 (a) 0.035 (b) quality (0.018) (0.019) Estimations by households Demand price elasticity -0.675 (a) -0.750 (a) (0.212) (0.142) Total expenditure elasticity 0.218 (a) 0.230 (a) (0.030) (0.070) Expenditure elasticity of 0.088 (a) 0.050 (c) quality (0.018) (0.020) Source: Produced by the authors from the study data. Note: Figures in parenthesis are standard errors computed by the bootstrapping procedure for the demand price elasticity and by the Delta method for the rest of the estimates. Statistical significance: (a) 1%, (b) 10% and (c) 5%.
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|Title Annotation:||Original research|
|Author:||Gonzalez-Rozada, Martin; Ramos-Carbajales, Alejandro|
|Publication:||Revista Panamericana de Salud Publica|
|Date:||Oct 1, 2016|
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