Unbeatable Imitation

We show that for many classes of symmetric two-player games, the simple decision rule "imitate-the-best" can hardly be beaten by any other decision rule. We provide necessary and sufficient conditions for imitation to be unbeatable in the sense that, even against a very clever opponent, imitation is subject to a money pump if and only if the relative payoff function of the game is of the rock-scissors-paper variety. For many interesting classes of games including examples like 2x2 games, Cournot duopoly, price competition, public goods games, common pool resource games, and minimum effort coordination games, we obtain an even stronger notion of the unbeatability of imitation.imitate-the-best, learning, symmetric games, relative payoffs, zero-sum games, rock-paper-scissors, finite population ESS, potential games, quasisubmodular games, quasisupermodular games, quasiconcave games, aggregative games

Social dilemmas, time preferences and technology adoption in a commons problem

Agents interacting on a body of water choose between technologies to catch fish. One is harmless to the resource, as it allows full recovery; the other yields high immediate catches, but low(er) future catches. Strategic interaction in one 'objective'resource game may induce several 'subjective' games in the class of social dilemmas. Which unique 'subjective'game is actually played depends crucially on how the agents discount their future payo¤s. We examine equilibrium behavior and its consequences on sustainability of the common-pool resource system under exponential and hyperbolic discounting. A sufficient degree of patience on behalf of the agents may lead to equilibrium behavior averting exhaustion of the resource, though full restraint (both agents choosing the ecologically or environmentally sound technology) is not necessarily achieved. Furthermore, if the degree of patience between agents is sufficiently dissimilar, the more patient is exploited by the less patient one in equilibrium. We demonstrate the generalizability of our approach developed throughout the paper. We provide recommendations to reduce the enormous complexity surrounding the general cases

COORDINATION, COOPERATION, AND THE EXTENDED COASEAN APPROACH TO ECONOMIC POLICY

The Coasean way to deal with the cooperation failure that is implicit in Pareto inefficiency is to remove or lessen the obstacles to cooperation through the attribution of property rights and the elimination or reduction of transaction costs. The relevance of this approach is however undermined by some intrinsic difficulties to its application in a real world context, such as those arising from the number and indeterminacy of the interested parties, as well as from the free rider problem. A way to extend the Coasean approach taking into account those real life limitations is to consider the local authorities as representatives of the interest of their local constituencies and, through the provision of an adequate institutional framework, to enhance the opportunities for cooperation through voluntary agreements involving private and public parties. Thus the extent of cooperation could be widened, as opposite to traditional remedial actions relying on non- contractual, or direct entrepreneurial action by the state. With the reduction in the appeal of direct and coercive action by the state a number of institutions emphasising the contractual cooperation between public and private parties have effectively grown of importance, as wide apart as the township and village enterprises in China, or the “programmazione negoziata” in Italy. In the final part of the paper the lattercoase theorem, economic policy, transition, property rights, cooperation, coordination

Unbeatable Imitation

We show that for many classes of symmetric two-player games, the simple decision rule "imitate-the-best" can hardly be beaten by any other decision rule. We provide necessary and sufficient conditions for imitation to be unbeatable and show that it can only be beaten by much in games that are of the rock-scissors-paper variety. Thus, in many interesting examples, like 2x2 games, Cournot duopoly, price competition, rent seeking, public goods games, common pool resource games, minimum effort coordination games, arms race, search, bargaining, etc., imitation cannot be beaten by much even by a very clever opponent