Monty Hall's Three Doors for Dummies
Monty Hall's three doors problem is a well-known "anomaly" in economics. It appears to be an example of a systematic violation of the assumption of subjects' rationality. Many papers have studied the Monty Hall anomaly under different perspectives (i.e. computerizing, learning, grouping, talking, and even teaching how to play it), but the anomaly still survives. The most common explanation for this is that subjects are unable to carry out correctly the Bayesian updating necessary. Our approach is different from all previous attempts to explain and correct the Monty Hall anomaly, inasmuch we developed a more radical "debiasing test". Even if the game remains identical in terms of probabilities and subjects task, we eliminate the necessity for any Bayesian updating, as our new framework does not require subjects to make any probability calculations. Consequently, having eliminated the cause, also the effect should have disappeared. In order to make our results robust, we also run an intermediate treatment. Even though we observe an evident monotonic increase in the switching percentage across the three treatments, as we expected (from 41.5% in the treatment that replicates the standard design, to 45.5% for the intermediate treatment, up to 58% in the new framework), this percentage remains still too low, even though no Bayesian updating is involved. These results drive us to conclude that this anomaly, even if attenuated by design conditions, is not a weak effect, but rather a systematic behavioural regularity. It could be attributed to some psychological underpinnings, such as the status quo bias. We comment on these, and alternative explanations, in our conclusions.
|Date of creation:||Feb 2007|
|Date of revision:||Feb 2007|
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- Tilman Slembeck & Jean-Robert Tyran, 2002.
"Do Institutions Promote Rationality? An Experimental Study of the Three-Door Anomaly,"
University of St. Gallen Department of Economics working paper series 2002
2002-21, Department of Economics, University of St. Gallen.
- Slembeck, Tilman & Tyran, Jean-Robert, 2004. "Do institutions promote rationality?: An experimental study of the three-door anomaly," Journal of Economic Behavior & Organization, Elsevier, vol. 54(3), pages 337-350, July.
- Daniel Kahneman & Jack L. Knetsch & Richard H. Thaler, 1991. "Anomalies: The Endowment Effect, Loss Aversion, and Status Quo Bias," Journal of Economic Perspectives, American Economic Association, vol. 5(1), pages 193-206, Winter.
- Selten, Reinhard & Joachim Buchta, 1994. "Experimental Sealed Bid First Price Auctions with Directly Observed Bid Functions," Discussion Paper Serie B 270, University of Bonn, Germany.
- Friedman, Daniel, 1998. "Monty Hall's Three Doors: Construction and Deconstruction of a Choice Anomaly," American Economic Review, American Economic Association, vol. 88(4), pages 933-46, September.
- Ignacio Palacios-Huerta, 2002.
"Learning to Open Monty Hall's Doors,"
2002-23, Brown University, Department of Economics.
- Page, Scott E., 1998. "Let's make a deal," Economics Letters, Elsevier, vol. 61(2), pages 175-180, November.
- Erev, Ido & Roth, Alvin E, 1998. "Predicting How People Play Games: Reinforcement Learning in Experimental Games with Unique, Mixed Strategy Equilibria," American Economic Review, American Economic Association, vol. 88(4), pages 848-81, September.
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