Abstract:Most game-theoretic accounts of institutions reduce institutions to behavioural patterns the players are incentivized to implement. An alternative account linking institutions to rule-following behaviour in a game-theoretic framework is developed on the basis of David Lewis’s and Ludwig Wittgenstein's respective accounts of conventions and language games. Institutions are formalized as epistemic games where the players share some forms of practical reasoning. An institution is a rule-governed game satisfying three conditions: common understanding, minimal awareness and minimal practical rationality. Common understanding has a strong similarity with Ludwig Wittgenstein's concept of lebensform while minimal awareness and minimal practical rationality capture the idea that rule-following is community-based.
Economists have been investigating the link between institutions and economic performance for several years. While econometric studies of this link have flourished, they are of limited use in understanding the causal mechanisms making some institutions responsible for economic performance. Several works using game theory and akin to the 'new institutional economics' have entertained the goal of developing micro-explanations of the institutions-performance link. Because game theory focuses on individuals' actions and beliefs, game-theoretic studies of institutions are thought to oppose more 'structuralist' explanations that downplay the role of individual agents and put more emphasis on the importance of social (or 'macro') structures. This paper demonstrates that this claim is misconceived, as the micro-explanations produced by game-theoretic models must assume already existing macro-structures. Institutions produce downward effects, shaping each agent's action. Moreover, in a game-theoretic framework, macro-structures are constitutive of individual agency since, without them, agents would often be unable to choose. I illustrate this claim with the example of Avner Greif's study of the role of cultural beliefs in the economic organisation of medieval societies. *
This article presents a community-based account of salience as an alternative and a complement to the ‘natural salience’ approach which is endorsed by almost all game theorists who use this concept. While in the naturalistic approach, salience is understood as an objective and natural property of some entities (events, strategies, outcomes), the community-based account claims that salience is a function of community membership. Building on David Lewis’s theory of common knowledge and on some of its recent refined accounts, I suggest that salience acts as a correlating device in a correlated equilibrium. What is constitutive of salience is common understanding, the fact that agents have common knowledge that they share the same modes of reasoning with respect to a well-identified set of events. I argue that the basis for common understanding is community membership. The relevance of this account stems from the fact that it answers the objection that salience is either unnecessary or unable to account for coordination between rational agents.
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