No Switchbacks: Rethinking Aspiration-Based Dynamics in the Ultimatum Game
AbstractThe stylized facts of ultimatum bargaining in the experimental lab are that offers tend to be near an equal split of the surplus and low, near perfect offers are routinely rejected. Bimmore et al (1995) use aspiration-based evolutionary dynamics to model the evolution of fair play in a binary choice version of this game, and show that incredible threats to reject low offers persist in equilibrium. We focus on two possible extensions of this analysis: (1) the model makes assumptions about agent motivations (aspiration levels) and the structure of the game (binary strategy space) that have not yet been tested experimentally, and (2) the standard dynamic is based on the problematic assumption that unhappy games who switch strategies may end up using the same strategy that was just rejected. To examine the implications of not allowing agents to “switch back” to their original strategy, we develop a “no switchback dynamic” and run a new, binary choice, experiment with induced aspirations. We find that the resulting dynamic predicts the evolution of play better than the standard dynamic and that aspirations are a significant motivator for our participants.
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Bibliographic InfoPaper provided by Middlebury College, Department of Economics in its series Middlebury College Working Paper Series with number 0218.
Length: 30 pages
Date of creation: Jun 2002
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ultimatum game; learning; aspirations; switchbacks; replicator dynamics;
Other versions of this item:
- Jeffrey Carpenter & Peter Matthews, 2005. "No Switchbacks: Rethinking Aspiration-Based Dynamics in the Ultimatum Game," Theory and Decision, Springer, vol. 58(4), pages 351-385, 06.
- Jeffrey Carpenter & Peter Hans Matthews, 2003. "No Switchbacks: Rethinking Aspiration-Based Dynamics in the Ultimatum Game," Middlebury College Working Paper Series 0218r, Middlebury College, Department of Economics.
- C78 - Mathematical and Quantitative Methods - - Game Theory and Bargaining Theory - - - Bargaining Theory; Matching Theory
- C91 - Mathematical and Quantitative Methods - - Design of Experiments - - - Laboratory, Individual Behavior
This paper has been announced in the following NEP Reports:
- NEP-ALL-2002-07-21 (All new papers)
- NEP-EXP-2002-07-21 (Experimental Economics)
- NEP-MIC-2002-07-22 (Microeconomics)
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