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Nothing But the Truth? Experiments on Adversarial Competition, Expert Testimony, and Decision Making

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  • Cheryl Boudreau
  • Mathew D. McCubbins

Abstract

Many scholars debate whether a competition between experts in legal, political, or economic contexts elicits truthful information and, in turn, enables people to make informed decisions. Thus, we analyze experimentally the conditions under which competition between experts induces the experts to make truthful statements and enables jurors listening to these statements to improve their decisions. Our results demonstrate that, contrary to game theoretic predictions and contrary to critics of our adversarial legal system, competition induces enough truth telling to allow jurors to improve their decisions. Then, when we impose additional institutions (such as penalties for lying or the threat of verification) on the competing experts, we observe even larger improvements in the experts' propensity to tell the truth and in jurors' decisions. We find similar improvements when the competing experts are permitted to exchange reasons for why their statements may be correct.

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  • Cheryl Boudreau & Mathew D. McCubbins, 2008. "Nothing But the Truth? Experiments on Adversarial Competition, Expert Testimony, and Decision Making," Journal of Empirical Legal Studies, John Wiley & Sons, vol. 5(4), pages 751-789, December.
    • Handle: RePEc:wly:empleg:v:5:y:2008:i:4:p:751-789
    DOI: 10.1111/j.1740-1461.2008.00140.x
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    References listed on IDEAS

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    Cited by:

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    2. Kim, Chulyoung, 2016. "Adversarial bias, litigation, and the Daubert test: An economic approach," International Review of Law and Economics, Elsevier, vol. 47(C), pages 67-75.
    3. Aimone, Jason A. & Hudja, Stanton & Law, Wilson & North, Charles M. & Ralston, Jason & Rentschler, Lucas, 2023. "An experimental exploration of reasonable doubt," Journal of Economic Behavior & Organization, Elsevier, vol. 212(C), pages 873-886.
    4. Albertazzi, Andrea & Ploner, Matteo & Vaccari, Federico, 2021. "Welfare in Experimental News Markets," SocArXiv 5j2w8, Center for Open Science.
    5. Albertazzi, Andrea & Ploner, Matteo & Vaccari, Federico, 2024. "Welfare and competition in expert advice markets," Journal of Economic Behavior & Organization, Elsevier, vol. 219(C), pages 74-103.
    6. Alice Guerra & Maria Maraki & Baptiste Massenot & Christian Thöni, 2023. "Deterrence, settlement, and litigation under adversarial versus inquisitorial systems," Public Choice, Springer, vol. 196(3), pages 331-356, September.
    7. Cheryl Boudreau & Mathew D. McCubbins & Daniel B. Rodriguez & Nicholas Weller, 2010. "Making Talk Cheap (and Problems Easy): How Legal and Political Institutions Can Facilitate Consensus," Journal of Empirical Legal Studies, John Wiley & Sons, vol. 7(4), pages 868-885, December.
    8. Minozzi, William & Woon, Jonathan, 2016. "Competition, preference uncertainty, and jamming: A strategic communication experiment," Games and Economic Behavior, Elsevier, vol. 96(C), pages 97-114.
    9. Cheryl Boudreau & Mathew D. McCubbins, 2009. "Competition in the Courtroom: When Does Expert Testimony Improve Jurors' Decisions?," Journal of Empirical Legal Studies, John Wiley & Sons, vol. 6(4), pages 793-817, December.

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