zero expenditures and the estimation of engel curves over the brief interview periods typical of budget surveys such as the u k family expenditure survey households recorded expenditures are liable to be misleading indicators of their underlying consumption most starkly a household may not be observed to purchase commodities that it nevertheless consumes this paper considers the implications of such measurement errors for the estimation of demand systems and derives a consistent estimator for the special case of linear engel curves

household food demand in burkina faso implications for food policy abstract chronic food production deficits since the early 1970s have prompted policymakers of burkina faso to emphasize technological research with the goal of increasing the production of the most consumed locally grown cereals sorghum millet and maize meanwhile urban consumers have been developing preferences for rice and wheat cereals that are primarily imported this study estimates demand relationships among food items in ouagadougou burkina the results of the estimation suggest that prices income household composition education marital status and urbanization were jointly important in explaining household expenditure allocations both local and imported cereal consumption responded positively to an income increase however incremental income changes would lead to relatively greater consumption of locally produced cereals by low income households whereas high income households would consume relatively more wheat and rice the household model is then used to demonstrate its relevance in addressing food policy issues by forecasting the levels of urban grain demand under alternative income and demographic scenarios with increased production due to advances in technology the urban demand levels do not exhaust the rural surplus of local cereals but deficits persist in the rice wheat sector the results underscore the importance of technological research since burkina could become self sufficient in at least the production of sorghum millet and maize

informational smallness and the scope for limiting information rents abstract for an incomplete information model of public good provision with interim participation constraints we show that efficient outcomes can be approximated with approximately full surplus extraction when there are many agents and each agent is informationally small the result holds even if agents payoffs cannot be unambiguously inferred from their beliefs the contrary result of neeman z neeman the relevance of private information in mechanism design j econ theory 117 2004 55 77 rests on an implicit uniformity requirement that is incompatible with the notion that agents are informationally small because there are many other agents who have information about them

modeling food consumption decisions as a two step process this article evaluates the suitability of tobit analysis of food consumption patterns by comparing results generated by a tobit model and a modification with a two step decision process two samples of adult women were selected from the 1977 78 nationwide food consumption survey and the 1985 continuing survey of food intakes by individuals results show strong statistical evidence for questioning tobit analysis in examining food consumption decisions determinants of the decision to consume food within a particular food group often differ from the determinants of how much to consume particularly for more highly defined food groupings analysis of u s food consumption patterns and their dietary aspects with respect to consumer behavior has a long history traditionally ordinary least squares ols or some variant has been used in many studies where ols was not appropriate the tobit method was applied tobit allows for a discrete mass point for observations as well as a continuous range of values for the dependent variable this nonlinear method has yielded good results in a variety of studies e g mccracken and brandt lane and devaney and fraker this article examines the suitability of the tobit method for analysis of food consumption patterns the tobit method assumes that the decision to consume a given food item is the same as the decision about the amount of the food to consume ignoring the two step nature of the decision process may hamper understanding of true behavioral patterns lead to erroneous conclusions and generate incorrect policy recommendations this article compares results generated by a tobit model and a modification with a two step decision process in the next section the statistical methods used to test whether food consumption is a one or two step decision process are described the following sections discuss the variables and data present the results and consider the conclusions

asymmetric enforcement of cooperation in a social dilemma we use a public good experiment to analyze behavior in a decentralized asymmetric punishment institution the institution is asymmetric in the sense that players differ in the effectiveness of their punishment at the aggregate level we observe remarkable similarities between outcomes in asymmetric and symmetric punishment institutions controlling for the average punishment effectiveness of the institutions we find that asymmetric punishment institutions are as effective in fostering cooperation and are as efficient as symmetric institutions at the individual level we find that players with higher punishment effectiveness contribute similar amounts to the public account but have higher earnings and punish more than their weak counterparts

do reputation feedback systems really improve trust among anonymous traders an experimental study feedback systems are claimed to be a crucial component of the success of electronic marketplaces like ebay or amazon marketplace this article aims to compare the effects of various feedback systems on trust between anonymous traders through a set of experiments based on the trust game our results indicate that trust is significantly improved by the introduction of a reputation feedback system however such mechanisms are far from being perfect and are vulnerable to strategic ratings and reciprocation our findings indicate that some changes in rating rules may significantly improve the efficiency of feedback systems by avoiding strategic rating or reciprocation and hence stimulate trust and trustworthiness among traders in particular a system in which individuals are not informed of their partner s rating decision before making their own decision provides better results both in terms of trust and earnings

excess capacity and collusion in this paper the authors analyze a restricted class of equilibria in the dynamic model of j p benoit and v krishna 1987 in which firms choose their scale of operation before engaging in a repeated game of price competition benoit and krishna established that all firms carry excess capacity in all collusive equilibria as the authors are interested in the relationship between excess capacity and collusion in price they examine equilibria in which firms tacitly collude in price but not in investment decisions copyright 1990 by economics department of the university of pennsylvania and the osaka university institute of social and economic research association

horizontal mergers and collusive behavior abstract in the industrial organization literature it is generally felt that mergers hurt consumers not only because of the increased industrial concentration they effect but also because collusion becomes more likely in this paper we show that at least in one important case this intuition is misguided if a tacitly collusive agreement enforced by trigger strategies is not initially sustainable mergers will tend to reduce the chance that it becomes sustainable in the future this is so because the threat point implicit in the agreement becomes more favorable for outsiders

majority voting and the welfare implications of tax avoidance abstract a benchmark result in the political economy of taxation is that majority voting over a linear income tax schedule will result in an inefficiently high tax rate whenever the median voter has a below average income the present paper examines the role of tax avoidance for this welfare result for a right skewed distribution of taxed income we show that the political distortion from majority voting is increasing in the median voter s avoidance vice versa keeping the decisive voter s avoidance constant the political inefficiency is decreasing in the average level of avoidance in the economy

demand for food commodities by income groups in indonesia an analysis of the structure of demand was performed on household data classified into income groups for urban indonesia a demographically augmented linearized almost ideal demand system was used to estimate the structural parameters of the demand equations endogenous switching regression techniques yielded unbiased and consistent demand parameter estimates for the low income group which had a large number of zeros for some food groups standard seemingly unrelated equation techniques were used to estimate the demand parameters for the other income groups the results showed demands for the medium to high and high income households to be responsive to prices income and demographic variables demands for the medium to low income households were responsive to income and prices only demands for low income households were responsive to income and prices of rice and fish only

asymmetric network monitoring and punishment in public goods experiments abstract we extend the recent experimental literature on incomplete punishment networks in linear public goods games in these games we use an exogenous network to restrict both monitoring and the set of feasible punishment flows in addition to two baseline structures the complete network and the circle network we examine a novel asymmetric network in which both punishment responsibility and exposure differ across players average contributions are significantly lower in the asymmetric network driven entirely by the under monitored player who faces only one potential punisher we formulate and examine the hypothesis that asymmetry among a player s potential punishment targets may lead to discriminatory patterns of punishment in particular players might wish to punish targets for whom they are solely responsible discriminately more than targets for whom they share responsibility the experimental data do not support this hypothesis although they do suggest a compelling explanation as to why specifically we find that the under monitored player in the network retaliates against previous punishment significantly more often than others in the group which deters their only potential punisher from issuing stronger sanctions thus an additional complication of asymmetry in the network is that it may lead to more instances of anti social retaliation inhibiting the effectiveness of the decentralized punishment institution

scope economies and technical efficiency of cocoa agroforesty systems in ghana a number of studies have addressed issues relating to the physiological environmental and economic values of trees in cocoa farming systems however to date little has been done to quantitatively examine the effect of crop diversity on cocoa farming efficiency this study therefore sets out to first investigate whether and to what extent crop diversity defined as the mixing of cocoa with other crop species on farmers plots affects productivity on cocoa farms secondly it sought to establish whether there are economies of scope i e cost complementarities from the sharing of farm inputs by crops on the same plots our results indicate that diversified i e multi crop cocoa farms are more efficient than single i e mono crop farms furthermore our estimate for the economies of scope parameter indicates possibilities for cost complementarities between production of cocoa and other crops on the same plot we advocate further investigation on the issue of scope economies to determine which crop combinations offer better cost complementarities and also meet biodiversity conservation objectives

do non strategic sanctions obey the law of demand the demand for punishment in the voluntary contribution mechanism abstract the prospect of receiving a monetary sanction for free riding has been shown to increase contributions to public goods we ask whether the impulse to punish is unresponsive to the cost to the punisher or whether like other preferences it interacts with prices to generate a conventional demand curve in a series of experiments we randomly vary the cost of reducing the earnings of other group members following voluntary contribution decisions in our design new groups are formed after each interaction and no subject faces any other more than once so there is no strategic reason to punish we nonetheless find significant levels of punishment and we learn that both price and the extent to which the recipient s contribution is below the group mean are significant determinants of the quantity of punishment demanded moreover punishment is mainly directed at free riders even when it costs nothing to the punisher

demographic variables in demand analysis in this paper the authors discuss five procedures for incorporating demographic variables into theoretically plausible demand systems translating scaling and the gorman reverse gorman and implicit prais houthakker procedures these five procedures are used to incorporate a single demographic variable the number of children in a household into the generalized ces demand system using household budget data for the united kingdom for the period 1966 1972 excerpt

the demand for dairy products structure prediction and decomposition this article presents an analysis of the demand for dairy products first the structure of dairy product demand is estimated using the household food consumption survey data under the assumption of a two stage budgeting procedure a complete demand system for food incorporating demographic effects is estimated next using the demand relations estimated from cross section data prediction interval tests utilizing time series data are performed for milk and butter last factors affecting consumption are classified into economic and demographic effects and a decomposition of the causes of changes in demand over time is performed

charitable bequests and taxes on inheritances and estates aggregate evidence from across states and time this paper examines the impact of wealth transfer taxes on charitable bequests we exploit the fact that federal and state taxes on estates and inheritances vary over time states and real wealth levels the effects of taxes are estimated using pooled cross sectional data spanning several decades based on aggregated information from federal estate tax returns under several different specifications we find evidence of a strong incentive effect of estate and inheritance taxes on charitable bequests

food expenditures at home and away from home in the united states a switching regression analysis the results of this study showed that the decision to eat away from home was positively affected by income while the amount spent away from home was only affected by income again positively at higher levels of household income food expenditures at home were similarly affected by income only at higher levels of household income provided the household also ate away from home if the household did not eat away from home food expenditures at home were positively affected by income at all levels the effect decreasing in magnitude with the level of income a significant economic trend in recent vdecades is the declining share of consumer expenditures on food expenditures for food fell steadily from 20 0 of disposable personal income in 1960 to 16 1 in the third quarter of 1983 usda this drop occurred as a result of a decline in the share of consumer expenditures on food purchased for consumption at home the share of consumer expenditures on meals purchased at restaurants cafeterias and fast food chains remained constant at about 4 of disposable personal income hence the consumption of purchased meals away from home has become more important relative to food consumed at home a number of studies on food consumption at home and away from home have been made houthakker and taylor 1970 obtained results that indicate away from home food expenditures were more responsive to total consumption expenditures than at home expenditures based on 1960 61 household budget data time series data were also employed by houthakker and taylor to investigate the dynamics of food consumption prochaska and schrimper 1973 found that along with income the opportunity cost of time is an important factor in determining away from home food consumption fishe et al 1979 employing simple and heteroscedastic tobit models found that income and household specific circumstances are important determinants of restaurant expenditures lamm 1982 estimated a translog demand system for food consumed at home purchased meals and non food items his results indicated that consumers have been eating away from home more often primarily as a result of increases in their incomes recently huang and raunikar 1984 estimated engel equations for at home and away from home food expenditures using ordinary least squares and tobit regressions respectively in their study huang and raunikar found that in general at home food consumption is less income responsive than away from home food consumption the major objective of huang and raunikar s study was to investigate the importance to household food expenditures of consigned income for committed expenditures this study further investigates food consumption at home and away from home employing a switching regression model the same basic data analyzed by huang and rauniker hr are also analyzed here however since the hr study focused on consigned income households not reporting complete information with regard to committed expenditures e g rent or mortgage or after tax income were not included in their study in this study the emphasis is placed on the household s choice of whether to eat out and the factors affecting consequent away from home and at home food expenditures the sample includes all households that reported before tax income and is significantly larger than the sample used in the hr study

statistical models for zero expenditures in household budgets household budget surveys are an important source of data on consumer s expenditure not just for individual consumers but also for estimating national aggregates however it is a widespread finding that for certain commodities most notably tobacco and alcohol the estimate from the household survey falls short of the known consumption total calculated with some confidence from data on production imports exports and excise duties for example in the british family expenditure survey with which we shall largely be concerned total tobacco expenditure was underestimated in 1976 by 21 percent see kemsley redpath and holmes 1980 p 51 much of this understatement together with that on alcohol is thought to occur because of the design of the survey which excludes many persons amongst whom consumption of such items is thought to be atypically high e g prisoners hoteliers and their residents merchant seamen even so the possibility remains that some of the understatement is due to various types of misreporting by households included in the survey in this paper we consider a model in which the standard tobit specification tobin 1958 is supplemented by the operation of a simple binary censor the tobit model is essentially a linear regression model in which non positive observations of the dependent variable are replaced by zero we take this specification as our starting point but add a second censoring process that randomly replaces a fraction of the observations generated by the tobit model bv zeroes the combined model can serve as a representation of several types of

elasticities in aids models in the literature a variety of approaches have been used to calculate demand elasticities in almost ideal demand system aids models of demand it is common to estimate the linear approximate almost ideal demand system la aids instead of the aids when the la aids is estimated all of the previously reported approaches to compute elasticities are theoretically incorrect this paper presents correct formulas for la aids elasticities and illustrates the potential errors from using incorrect computing the almost ideal demand system aids of deaton and muellbauer 1980a b has become popular in recent years anderson and blundell blanciforti and green 1983a b blanciforti green and king chalfant eales and unnevehr fujii khaled and mak fulponi heien and willett murray parsons ray a variety of approaches to computing elasticities has been used and some of the approaches may lead to significant errors this paper clarifies the differences between alternative approaches to estimating demand elasticities in aids models

estimation of a two level demand system with limited dependent variables a two level demand model was derived from a strongly separable conditional indirect utility function to analyze dominican rural and urban household consumption at different income levels for samples with significant zero consumption a multivariate limited dependent variable model utilizing the concept of virtual prices was used to obtain consistent estimates of consumption parameters results show that households with higher incomes tend to be less responsive to own price and income changes in consumption of most food and nonfood commodities for demographic variates the elasticities of rice and aggregate food with respect to household composition variables are all positive with few exceptions price and income responses of household food and nonfood consumption have significant policy importance this study provides insights into the consumption behavior of rural and urban dominican households within the framework of a complete demand system three basic groups of determinants of household consumption are explored commodity prices household total expenditure and demographic variables our treatment of these fundamental issues involves the application to demand analysis of a a classical theoretical result about commodity decentralization and price aggregation and b an econometric technique to deal with limited dependent variables in the demand system framework the analysis of detailed commodities is often prohibitive because increasing the size of the demand system substantially increases the number of unknown parameters to estimate a relatively large number of parameters in this study the theoretical implications of twostage budgeting and perfect price aggregation are used to construct a two level demand model that is consistent with constrained util

demand analysis of fresh and frozen finfish and shellfish in the united states household expenditures for at home consumption on three species of shellfish and five species of finfish were analyzed factors explaining the variation of expenditures on seafood commodities were own price household income coupon value household size geographic region urbanization race and seasonality own price elasticities ranged from 0 45 flounder sole to 1 13 oysters expenditures on fishery products were more sensitive to changes in household size than to changes in household income cross price effects of red meat and poultry were not statistically significant for comparison purposes estimates of own price income and household size elasticities from the literature were made with this set of elasticities