An Analysis of Household Responses to Price Shocks in Vietnam: Can Unit Values Substitute for Market Prices?
AbstractThis paper examines the robustness of Deaton’s widely used method for estimating consumer responses. While unit values, ratios of expenditures to quantities purchased, are often employed in demand analysis as proxies for missing market prices, Deaton argues bias is likely to result as a consequence of both quality effects and measurement error. Hence he proposes a procedure that corrects the bias and enables price elasticities to be obtained in the absence of explicit price information. Given the availability of market price data and unit values in Vietnam, this paper estimates a food demand system and investigates the usefulness of Deaton’s method. It also takes the analysis a step further to the existing literature by computing the welfare impact of price changes to see how Deaton’s method performs in this context. The results demonstrate that Deaton’s method generates materially different price elasticities from those estimated with market prices. However, it produces relatively similar results for the welfare analysis. Deaton’s procedure therefore appears to be valid in welfare analysis at least in the case of Vietnam, but the findings also indicate that its use by policymakers should carry a strong health warning.
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Bibliographic InfoPaper provided by Poverty Research Unit at Sussex, University of Sussex in its series PRUS Working Papers with number 30.
Length: 60 pages
Date of creation: May 2005
Date of revision:
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consumer demand; price elasticities; unit values; quality; welfare analysis; Vietnam;
Find related papers by JEL classification:
- D12 - Microeconomics - - Household Behavior - - - Consumer Economics: Empirical Analysis
- R2 - Urban, Rural, Regional, Real Estate, and Transportation Economics - - Household Analysis
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