Transitivity

Abstract

Transitivity is formally just a property that a binary relation might possess, and thus one could discuss the concept in any context in economics in which an ordering relation is used. Here, however, the discussion of transitivity will be limited to its role in describing an individual agent’s choice behaviour. In this context transitivity means roughly that if an agent chooses A over B , and B over C , that agent ought to choose A over C , or at least be indifferent. On the surface this seems reasonable, even ‘rational’, but this ignores how complicated an agent’s decision making process can be. For an excellent discussion of this issue see May (1954). Given a model of agent behaviour, transitivity can be imposed as a direct assumption, or can be an implication of the model for choice behaviour. The standard model of agent behaviour in economics is that the agent orders prospects by means of a utility function, which in effect assumes transitivity. With appropriate continuity and convexity restrictions on utility functions, the model allows one to demonstrate that: (1) Individual demand functions are well defined, continuous, and satisfy the comparative static restriction, the strong axiom of revealed preference (SARP).

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