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arXiv 1206.4181math.OCcs.GTmath.DS
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高阶博弈动力学

Higher Order Game Dynamics

Rida Laraki, Panayotis Mertikopoulos

摘要:

连续时间博弈动态是典型的一阶系统,其中收益决定了参与者策略份额的增长率。在本文中,我们通过将收益视为更高阶的变化力量来调查一阶之外发生的事情,例如,指定玩家进化的加速度而不是其速度(当涉及到聚合过去游戏实例的经验数据时,自然出现的观点)。为此,我们得到了广泛的一类高阶博弈动力学,推广一阶模仿动力学,特别是复制动力学。我们发现,严格劣势策略在n阶支付单调动态中灭绝的速度与相应的一阶动态一样快;此外,与一阶动态形成鲜明对比的是,弱劣势策略也会在n>1时灭绝。总而言之,高阶报酬单调动态导致弱劣势策略的消除,随后是严格劣势策略的迭代删除,从而为Dekel和Fudenberg(1990)的著名认识理性化过程提供了动态证明。最后,我们还建立了一个高阶类似的民间定理的进化对策论,我们表明,收敛到严格的平衡,在n阶动态是n阶的速度作为一阶。

英文摘要:

Continuous-time game dynamics are typically first order systems where payoffs determine the growth rate of the players' strategy shares. In this paper, we investigate what happens beyond first order by viewing payoffs as higher order forces of change, specifying e.g. the acceleration of the players' evolution instead of its velocity (a viewpoint which emerges naturally when it comes to aggregating empirical data of past instances of play). To that end, we derive a wide class of higher order game dynamics, generalizing first order imitative dynamics, and, in particular, the replicator dynamics. We show that strictly dominated strategies become extinct in n-th order payoff-monotonic dynamics n orders as fast as in the corresponding first order dynamics; furthermore, in stark contrast to first order, weakly dominated strategies also become extinct for n>1. All in all, higher order payoff-monotonic dynamics lead to the elimination of weakly dominated strategies, followed by the iterated deletion of strictly dominated strategies, thus providing a dynamic justification of the well-known epistemic rationalizability process of Dekel and Fudenberg (1990). Finally, we also establish a higher order analogue of the folk theorem of evolutionary game theory, and we show that con- vergence to strict equilibria in n-th order dynamics is n orders as fast as in first order.

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