Game Theory & Math Economics: Ariel Rubinstein (TAU) - "Back to Fundamentals: Equilibrium in Abstract Economies" (co-authored with Michael Richter)

Sun, 04/01/201516:00-17:00
Elath Hall, 2nd floor, Feldman Building, Edmond J. Safra Campus

We propose a new abstract definition in the spirit of competitive equilibrium: a profile of alternatives and a public ordering (expressing prestige, price or a social norm), such that each agent prefers his assigned alternative to all lower-ranked ones. The equilibrium operates in an abstract setting built upon a concept of convexity borrowed from Convex Geometry.We apply the concept to a variety of convex economies and relate it to Pareto optimality. The "magic" of linear equilibrium prices is put into perspective by establishing an analogy between linear functions in the standard convexity and "primitive orderings" in the abstract convexity.