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The Limitations of Experimental Design: A Case Study Involving Monetary Incentive Effects in Laboratory Markets

Published online by Cambridge University Press:  14 March 2025

Steven J. Kachelmeier  and
Kristy L. Towry
Steven J. Kachelmeier*
Affiliation:
McCombs School of Business, University of Texas at Austin, 1 University Station B6400, Austin, TX 78712, USA
Kristy L. Towry*
Affiliation:
Goizueta Business School, Emory University, 1300 Clifton Road, Atlanta, GA 30322, USA
*
email: kach@mail.utexas.edu
email: Kristy_Towry@bus.emory.edu
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Abstract

We replicate an influential study of monetary incentive effects by Jamal and Sunder (1991) to illustrate the difficulties of drawing causal inferences from a treatment manipulation when other features of the experimental design vary simultaneously. We first show that the Jamal and Sunder (1991) conclusions hinge on one of their laboratory market sessions, conducted only within their fixed-pay condition, that is characterized by a thin market and asymmetric supply and demand curves. When we replicate this structure multiple times under both fixed pay and pay tied to performance, our findings do not support Jamal and Sunder's (1991) conclusion about the incremental effects of performance-based compensation, suggesting that other features varied in that study likely account for their observed difference. Our ceteris paribus replication leaves us unable to offer any generalized conclusions about the effects of monetary incentives in other market structures, but the broader point is to illustrate that experimental designs that attempt to generalize effects by varying multiple features simultaneously can jeopardize the ability to draw causal inferences about the primary treatment manipulation.

Keywords

experimental designmonetary incentivesmarket power

JEL classification

C92: Laboratory, Group Behavior
Type
Research Article
Information
Experimental Economics , Volume 8 , Issue 1 , April 2005 , pp. 21 - 33
Copyright
Copyright © 2005 Economic Science Association

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Footnotes

*

Author to whom correspondence should be addressed.

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