Simple Social Choice Rules for Exchange

We study the classical problem of trade in two-dimensional Euclidean space. It is known that there no efficient rule for this model compatible with dominant strategy incentives, is, and strategy-proof rule. observe that, addition to incentive constraints, informational constraints are also unavoidable social planners. Thus, we impose requirement finite dimensional messages be sufficient information realize a In addition, minimal fairness axioms anonymity weakening non-bossiness, as well continuity. The result class rules similar those characterized by Barbera Jackson [Strategy-proof exchange, Econometrica, 63 (1995), 51-87].