Edited by Jeff Bennett
Chapter 15: Incentive and Information Properties of Preference Questions: Commentary and Extensions
Richard T. Carson and Theodore Groves INTRODUCTION This chapter is both a commentary on and extension of Carson and Groves (2007) (hereafter CG) The substantial attention the paper has received has been enormously gratifying. Reception of CG has largely been positive with little if any substantive criticism directed toward it; and, there are many papers now being presented at conferences that are testing or relying on various aspects of it. Our remarks are organized into a series of short sections. The first points out that the main purpose of CG was to extend the revealed preference paradigm to cover some types of survey responses. The second notes that CG provides the theoretical foundation that some critics of contingent valuation (CV) had argued was missing. The third takes the concepts of ‘hypothetical’ and ‘hypothetical bias’ head on and argues that these concepts are, for the most part, ill-defined or simply wrong and have done enormous damage to clear and careful thinking about the nature of the response to stated preference questions. The fourth examines the properties of cheap talk which is often proposed as a way to reduce hypothetical bias. The fifth provides some elaboration on CG and the issue of how to interpret information extracted from preferences questions. The sixth poses an answer to the often asked question: is a single binary discrete choice (SBC) question always the best elicitation format for a researcher to use? The seventh provides some elaboration on the payment card elicitation format, which in recent...
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