30 Years of Being Wrong: A Systematic Review and Critical Test of the Cox and Wohlgenant Approach to Quality-Adjusted Prices in Demand Analysis

John Gibson and Bonggeun Kim ()
Additional contact information
Bonggeun Kim: Seoul National University

Working Papers in Economics from University of Waikato

Abstract: Most demand studies in agricultural economics fail to estimate quality responses to price. Instead, following Cox and Wohlgenant (1986), quality choice is dealt with by adjusting unit values rather than by treating quality as a valid consumer response to model. Studying a two-choice problem in this manner cannot identify either the price elasticity of quantity or the price elasticity of quality, and instead will yield some unidentified hybrid of the quality and quantity responses. We review 150 papers that cite Cox and Wohlgenant (1986) to see how widespread is the neglect of quality responses to price in the literature. Almost 90 percent of studies wrongly mix quality responses to price in with their reported quantity demand elasticities, thus, overstating by how much price rises can be expected to moderate the quantity consumed. Our empirical test, for 32 food and drink groups in Vietnam, shows that the Cox and Wohlgenant method exaggerates quantity responses to price by a factor of three, on average, and hardly differs from what naïve approaches with unit values show. These results cast doubt on three decades of reported price elasticities of quantity demand estimated from household survey data.

Keywords: demand; household surveys; quality; price; unit values (search for similar items in EconPapers)
JEL-codes: D12 I10 (search for similar items in EconPapers)
Pages: 27 pages
Date: 2017-08-03
New Economics Papers: this item is included in nep-agr and nep-sea
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (2)

Downloads: (external link)
https://repec.its.waikato.ac.nz/wai/econwp/1716.pdf (application/pdf)

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:wai:econwp:17/16

Access Statistics for this paper

More papers in Working Papers in Economics from University of Waikato Private Bag 3105, Hamilton, New Zealand, 3240. Contact information at EDIRC.
Bibliographic data for series maintained by Geua Boe-Gibson ().