Conditional and unconditional food demand elasticities in a dynamic multistage demand system

This paper estimates conditional and unconditional demand elasticities in a three stage analysis of consumer demand for food and non-food items in Greece. A dynamic version of the AIDS model is specified and estimated, and full system misspecification tests applied. Correction formulas for price and expenditure elasticities are used to calculate unconditional elasticities from conditional demand sub-systems. All food items rank as price inelastic. Deviations between the calculated conditional and unconditional price and expenditure elasticities are found to be significant, demonstrating the importance of correcting conditional elasticities before they can be used for policy purposes or welfare analyses.     

质疑食品价格管制 ——兼论政府管制职能定位

由于信息严重不对称,食品安全市场存在不同程度失灵。消费者对食品安全的需求是通过对食品安全的支付意愿向企业传递信号的,并以此激励企业提高食品安全水平。部分食品价格上涨是消费者增加食品安全需求的反应。借助案例研究发现,政府对食品价格管制将增加市场的不确定性,食品价格管制与食品安全管制目标间存在冲突。食品安全危机重重,政府应慎用价格管制。在经济转型过程中政府应明确管制职能定位,放松食品价格管制,切实有效地加强食品安全管制。     

Reference Pricing with Elastic Demand for Pharmaceuticals

In this paper, we re‐examine the properties of two commonly adopted government reimbursement schemes for pharmaceuticals: reference pricing and fixed percentage reimbursement. We depart from the previous literature by assuming that the individual demand is price‐sensitive and depends on the copayment rate (i.e., the part paid by each consumer). We obtain two novel results under reference pricing: first, as the copayment rate increases, so do pharmaceutical prices; second, this increase in pharmaceutical prices reduces social welfare. Whilst reference pricing does emerge as a preferable reimbursement scheme, demand elasticities and the copayment rate interact in complex ways. This leads (unexpectedly) to the possibility that a higher copayment rate (lower reimbursement rate) results in higher government expenditure.     

Consumption patterns in Sri Lanka: a decomposition analysis

Knowing consumer reaction to changes in prices and income is important in formulating microeconomic policies, such as public utility prices and commodity taxation. This paper analyses the consumption patterns of consumer goods grouped into eight broad commodities in Sri Lanka during the period 1975–2016, using a system-wide framework. The analysis indicates that Sri Lankan consumers allocate more than half of their income to food and nearly four fifths of their income to food, housing, and transport combined. The estimated income and own-price elasticities reveal that food, housing, medical care, and transport are necessities; clothing, durables and recreation are luxuries; and demand for all commodities is price inelastic except for recreation. To investigate the consumption growth pattern, we decomposed the growth in consumption and change in budget shares of the eight commodities into income, relative price, and change in taste. We also simulated per capita consumption expenditure of the eight commodities under various policy scenarios and found that income growth has played a significant role in Sri Lankan consumption patterns.     

The aggregate elasticity of factor substitution with middle products

The elasticity of substitution between factors in production relates the change in the ratio of factors used in a production process to a given change in the factor price ratio. An aggregate concept of such an elasticity relates a change in overall factor endowments to the resulting change in factor prices. For a closed economy the behavior of consumers is an important part of such an aggregate elasticity, since endowment changes can bring about changes in commodity prices and resulting adjustments to factor prices. For a small open economy, commodity prices in typical models are exogenous. In the model with middle products, all final consumer goods are non-traded, so that local consumer behavior can affect factor prices. The aggregate elasticity of substitution is shown to be an average of production elasticities and demand elasticity even for a small open economy.     

The effects of changes in household demographics and employment on consumer demand patterns

This study examines to what extent changes in consumer demand patterns over the last two decades in the Netherlands can be attributed to changes in household demographics, employment and total expenditures. The dominating changes in consumer demand are decreasing budget shares of food & beverages and clothing & footwear and increasing budget shares of housing and services. The changes in households’ composition – away from the traditional one-earner family with children – together with the increase in household total expenditures account for about one-third of the decrease in the budget share of food & beverages, half of the increase in the budget shares of services and only a minor part of the increase in housing. Once controlled for budget effects, the quadrupling of the proportion of employed women with young children accounts for about one-third of the increase in the budget shares of personal & health care – including childcare – and food away, holidays & entertainment.     

Estimating Purchasing Power Parities from Household Expenditure Data Using Complete Demand Systems with Application to Living Standards Comparison: India and Vietnam

This study departs from the previous literature on purchasing power parity (PPP) by proposing a demand system based methodology for calculating the PPP that takes account of consumer preferences and allows for the substitution effect of price changes. The methodology is used to calculate the PPP between the Indian Rupee and the Vietnamese Dong. The study allows for regional variation in preferences and price changes both inside the country and between countries. It proposes and applies a methodology for constructing prices from unit values after adjusting them for quality and demographic effects. The adjusted unit values are used as prices in the demand estimations, and the demand parameter estimates are used to calculate both spatial prices within each country and the PPP between the two countries within a consistent framework. The study illustrates the usefulness of preference consistent methods to calculate the PPP by applying the PPPs to compare living standards between India and Vietnam. The significance of the results follows from the fact that the levels of living comparisons are quite sensitive to the PPP used in converting the Rupee expenditure into Vietnamese Dong. The present results on food PPPs question the relevance of the PPPs from the ICP project in cross‐country welfare comparisons especially in a period of high food inflation.     

City size and household food consumption: demand elasticities in Spain

Are food price elasticities different across city sizes? The aim of this article is to estimate expenditure and own-price elasticities for 10 aggregated food product groups using the Spanish Household Budget Survey for the year 2010. These products are the ones for which the survey provides information regarding prices and quantities, thus allowing the application of an Almost Ideal Demand System (AIDS) model with censored data. The estimation procedure allows not only comparisons to be made among households with different levels of income, but also the contribution of residence characteristics to variations in demand. The results confirm that the size of the city in which the household resides has a similar significant and relevant effect on consumption patterns as family income level. This is especially clear with own-price elasticities. In Spain, large central cities show a greater response to price changes than smaller cities or rural peripheral areas.     

Optimal monetary policy in the presence of food price subsidies

Food price subsidies are a prevalent means by which fiscal authorities may counteract food price volatility in middle-income countries (MIC). We develop a DSGE model for a MIC that captures this key channel of a policy induced price smoothing mechanism that is different to, yet in parallel with, the classic Calvo price stickiness approach, which can have consequential effects for monetary policy. We then use the model to address how the joint fiscal and monetary policy responds to an increase in inflation driven by a food price shock can affect welfare. We show that, in the presence of credit constrained households and households with a significant share of food expenditures, a coordinated reaction of fiscal and monetary policies via subsidized price targeting can improve aggregate welfare. Subsidies smooth prices and consumption, especially for credit constrained households, which can consequently result in an interest rate reaction less intensely with subsidized price targeting compared with headline price targeting.     

Economies of scale and scope in petroleum refining

Despite evidence that aggregate consumption of complex carbohydrates has risen over the last decade, food consumption surveys suggest that fewer households are consuming less bread, pasta rice, potatoes and corn. This paper estimates systems of complex carbohydrae demand using cross-sectional data from 1977–78 and 1987–88 in order to explain this paradox. Changes in demand that are not explained by changes in prices or income are explained by variations in taste. Because tastes cannot be directly observed, the paper uses a multiple indicator and multiple cause (MIMIC) model to construct a suitable proxy variable. In the MIMIC approach, the ‘indicators’ are residuals from a household demand function that includes prices and incomes as explanatory variables, while household and demograhic proxies are ‘cause’ variables. The objectives in applying the MIMIC model are to determine the effect of consumer tastes on complex carbohydrate demand and, comparing cross-sectional survey data from two different periods, test the hypothesis that these tastes change over time. The data consist of US complex carbohydrate prices and expenditures, taken from the USDA Household Food Consumption Surveys in 1977–78 and 1987–88. The results show that structural changes in demand, or those that are not explained by changes in price, income, or the cause variables, led to an increase in complex carbohydrate demand of 5% from 1977–78 to 1987–88. However, changes in demand explained by the cause variables cause demand to fall by 9%.     

The effects of price on household demand for food and calories in poor countries: are our databases giving reliable estimates?

Food price policy relies heavily on estimated price elasticities of food demand to help balance the nutritional and economic objectives in poor countries. Economists use either unit values (ratios of household expenditure to quantity purchased) or community prices (enumerated from vendors in local markets) as proxies for market prices when estimating price elasticities with household survey data. Biases are believed to result from using unit values, due to measurement error and quality effects, but evidence on this issue is lacking and even less is known about community prices. This article provides an empirical evidence from Vietnam, which suggests that economists should exercise caution when estimating price elasticities from household surveys. A 14-food demand system is estimated alternatively with unit values or community prices, and the elasticity of calories with respect to rice prices is calculated. This elasticity is more than twice as large (?0.54 versus ?0.22) when community prices are used rather than unit values. Hence, conclusions about the nutritional effects of rice price increases appear sensitive to data choices made by economists. More generally, this discrepancy suggests that the household survey databases commonly used by economists may not provide reliable estimates.     

VALUING THE SERVICES OF CONSUMER DURABLES

Although consumer durables are treated as nondurables in most economic accounts, economists have long recognized that they could be treated as capital. If an estimate of the value of the services of consumer durables was available, it could be included in personal consumption expenditures and purchases of the durables treated as a form of investment. Such treatment would give a better picture of changes in a nation's economic welfare over time and make international comparisons more meaningful.
This article reviews the economic literature on how the services of consumer durables can be valued. It examines six alternative measures: the (1) user cost; (2) capital recovery; (3) opportunity cost; (4) market rental value; (5) cost of a substitute; and (6) cash-equivalent value measures. The first three are based on the summation of the costs of the inputs used to produce the services, although only the first two are consistent with the principle that the purchase price of a durable equals the discounted present value of its expected future benefits. The fourth and fifth measures are based on the prices of marketed services while the sixth is derived from the consumer's demand function for the good's services. The article also discusses six major issues in implementing these measures: (1) imputing a rate of return to capital; (2) measuring declines in market value (depreciation and capital gains); (3) accounting for operating expenditures; (4) adjusting for capacity utilization; (5) deflating service values; and (6) defining consumer durables.     

Calibration of incomplete demand systems in quantitative analysis

An easily implemented and flexible calibration technique for partial demand systems is introduced, combining recent developments in incomplete demand systems and a set of restrictions conditioned on the available elasticity estimates. The technique accommodates various degrees of knowledge on cross-price elasticities, satisfies curvature restrictions, and allows the recovery of an exact welfare measure for policy analysis. The technique is illustrated with a partial demand system for food consumption in Korea for different states of knowledge on cross-price effects. The consumer welfare impact of food and agricultural trade liberalization is measured.     

Environmental defensive expenditures and households behaviour in Italy

The paper explores the role of Environmental Defensive Expenditures in the consumption behaviour of Italian households. Environmental Defensive Expenditures are not borne to increase households' welfare, but to prevent or avoid the effects of a worsening environmental quality. The literature on environmental accounting argues that economic growth in industrialized countries is accompanied by an increasing load of defensive activities that may lead to a reorientation of consumption behaviour. In this work this hypothesis is tested using annual data on mean consumption expenditures of Italian households from 1985 to 1996. A complete system of demand is estimated and short-run price elasticities of demand for Defensive Expenditures are calculated. The complete system of demand functions is specified using the Quadratic Almost Ideal Demand System proposed by Banks, Blundell and Lewbel. Results show that there is very low substitution between the demand for the six aggregate goods in which total expenditure is here divided and the Environmental Defensive Expenditures. Thus it seems that an increase in Environmental Defensive Expenditures, driven by a change in environmental quality, would not lead to a change in the consumption pattern, at least as far as Italian households are concerned.     

European Integration and Production in the French Economy

Effects of greater European integration on the French economy are explored with an aggregate cost function. Input direct price elasticities are inelastic, but greatest (absolute value) for capital and lowest for imports. Cross-price elasticities suggest inputs are substitutes and are higher for domestic inputs than domestic input and imports pairs. As trade restrictions fall, effects on domestic input demand may increase as substitution elasticities rise. Inverse output supply price elasticities indicate domestic input prices are relatively important factors affecting consumption goods prices and import prices more important for investment goods. Thus, import price decreases may stimulate investment and growth. (JEL F14 , O10 , O12 )     

Microeconometric Analysis of Residential Water Demand

This paper develops a structural model for obtaining price elasticities and evaluating consumer’s response to changes in nonlinear tariffs when only panel data on household consumption are available. The model and the empirical strategy address problems implied by nonlinear tariffs, existence of a fixed cost, and use of limited data, giving rise to a random effects model with a nonlinear individual effect. Results show that the estimated model does well at fitting data and demand is inelastic, although elasticity varies by initial consumption block. Then, I estimate welfare consequences of implementing several demand policies.     

Poverty Effects of Higher Food Prices: A Global Perspective

The spike in international food prices between 2005 and the first half of 2008 drew much attention to the vulnerability of the poor to such shocks. This paper provides a formal assessment of the direct and indirect impacts of higher prices of agricultural goods on global poverty using a representative sample of 63–93% of the developing world's population. To assess the direct effects, the paper uses domestic food price data between January 2005 and December 2007—when the relative price of food staples rose by an average of 5.6%—to find that the number of individuals living under the extreme poverty line increased by 155 million, with almost three‐quarters of this increase taking place in East Asia. To take the second‐order effects into account, the paper links household survey data with a global general equilibrium model, finding that the same increase in consumer prices of agricultural goods (modeled by increasing demand for first‐generation biofuels) would raise the number of individuals living under extreme poverty by 32 million, with nearly the entire increase occurring in South Asia and Sub‐Saharan Africa.     

Quantity,quality and the welfare effects of US airline deregulation

In this paper we employ a method for estimationg quality-adjusted demand to calculate measures of the change in consumer suruplus due to US airline deregulation. The quality-adjusted estimates of the price elasticity of demand indicate that consumers are from 25% to 50% more sensitive to changes in air fares than unadjusted estimates would suggest. Changes in unadjusted consumer surplus overstate the net welfare gains from deregulation by roughly a factor of two, strongly suggesting that adjustments for quallity of service are essential to welfare analysis of regulatory changes in this industry     

On Price Caps Under Uncertainty

This paper shows how standard arguments supporting the imposition of price caps break down in the presence of demand uncertainty. In particular, though in the deterministic case the introduction or lowering of a price cap (above marginal cost) results in increased production, increased total welfare, decreased prices, and increased consumer welfare, we show that all of the above comparative statics predictions fail for generic uncertain demand functions. For example, for price caps sufficiently close to marginal cost, a decrease in the price cap always leads to a decrease in production and total welfare under certain mild conditions. Under stronger regularity assumptions, all of the monotone comparative statics predictions from the deterministic case also do not hold for a generic uncertain demand if we restrict attention to price caps in an arbitrary fixed interval (as long as the price caps are binding for some values in that interval).     

Microeconomic modeling of parallel markets: The case of agricultural goods in the USSR

In a centrally planned economy, non-market-clearing prices fixed by the state cannot be used directly to estimate consumer behavior models. This paper represents an attempt to overcome this problem by utilizing prices in a parallel “free” market. An equilibrium model incorporating parallel markets is discussed and a demand curve arising from this model is estimated using data for the markets for meat and milk in the USSR. the price and income elasticities of demand for these goods are found to be significantly higher than those estimated for the United States.