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Ken Binmore: Behavioral Scientist

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Abstract

This paper discusses Ken Binmore’s contribution to the debate on other-regarding preferences with reference to his contributions on equilibrium selection in non-cooperative games. We first assess his claim that the experimental evidence in favor of different types of social preferences has been vastly exaggerated. Then, we compare Binmore’s contribution with some recent developments of the literature. We show that recent experimental evidence lends support to his view that subjects’ behavior is mostly driven by a combination of learning and selfishness. From a theoretical point of view, we show that Binmore’s positions foreshadowed what is today known as the Social Heuristic Hypothesis.

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Notes

  1. The word “reciprocity” is used in different ways in the literature. Binmore’s variety corresponds to what is usually termed direct reciprocity and must be distinguished from strong reciprocity, which is more popular among defenders of the social preferences approach. See for example Bowles and Gintis (2013).

  2. Game theory also explains how norms emerge. I have no space in this note to address this issue.

  3. See Bicchieri (2006) for a modern view on social norms based on this approach.

  4. “A fundamental point is that biologists almost always deal with the genetic mechanism of natural selection. This mechanism admits a simple, canonical dynamical representation [...] For economists the social mechanisms of learning and imitation are usually more important than the genetic mechanism. A wide variety of learning and imitation processes are conceivable and the appropriate dynamical representation seems to be highly context-dependent.” (Friedman 1991).

  5. See Weibull (1997) and Fudenberg and Levine (1998) for early surveys of the literature and Sandholm (2010) for a more recent treatment.

  6. I take this story from Holt (2007).

  7. The literature on social preferences is huge. An early survey of the literature is contained in Camerer (2003) while Cooper and Kagel (2011) contains a more up-to-date bibliography.

  8. Binmore spells out the condition that make a good experiment as (a) The game is simple, and presented to the subjects in a user-friendly manner, (b) The subjects are paid adequately for performing well, (c) Sufficient time is available for trial-and-error learning. See for example Binmore (2007).

  9. For example, “Nobody thinks that [the Replicator Dynamics] is anywhere near adequate by itself to predict how real individuals learn” Binmore (2010).

  10. “Experimenters responded to these [...] learning papers by largely ignoring them”, (Cooper & Kagel, 2011). For a review of the literature see Chaudhuri (2011) and Fehr and Schurtenberger (2018).

  11. After an initial burst of enthusiasm for the explanations based on pure social preferences like inequity aversion or altruism, another strand of the literature emerged which stresses other motives behind subjects’ deviations from pure egoism. A prominent example in this direction is (Andreoni & Bernheim, 2009), in which pro-social behavior in experimental settings is explained in terms of a desire to preserve one’s own social image in front of an audience. This type of pro-social behavior would disappear in a truly anonymous setting. Notice that this line of research is broadly in agreement with Binmore’s position. An important difference, however, is that theoretical models of this type rely on the assumption that inexperienced subjects maximize a well-defined utility function, albeit more complex than the purely egoistic one which is common in standard economic models. Binmore instead believes that the attempt to rationalize the behavior of a subject playing a game for the first time is doomed to fail. (I thank an anonymous referee for attracting my attention on this issue.)

  12. This distinction is reminiscent of the old dichotomy between the eductive and the evolutive approach to equilibrium selection that Binmore introduced in Binmore (1987, 1988). In eductive models of equilibrium selection, e.g. in the tracing procedure introduced by Harsanyi and Selten (1988), the focus in on the way perfectly rational players would get to an equilibrium by simply thinking (assuming the pose of Rodin’s Thinker (Binmore, 1998a, p. 87)) before a simultaneous moves game is played.

  13. Axelrod’s work was crucial in the generation of the very large literature on the repeated PD. However, Binmore’s opinion was that Axelrod’s work added little to what game theorist already knew at that time. See Binmore (1998b).

  14. Binmore worked on the tradition started by Abreu and Rubinstein (1988).

  15. Holler and Klose-Ullmann (2020) contains a detailed analysis of Axelrod’s experiment and a discussion of the lessons that Axelord believed could be learned from it.

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Acknowledgements

I thank Ken Binmore, Manfred J. Holler and two anonymous referees for their comments on a previous version of this note.

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Correspondence to Luciano Andreozzi.

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Andreozzi, L. Ken Binmore: Behavioral Scientist. Homo Oecon (2022). https://doi.org/10.1007/s41412-021-00117-0

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