Continuous-Time Public Good Contribution Under Uncertainty: A Stochastic Control Approach

Continuous-Time Public Good Contribution Under Uncertainty: A Stochastic Control Approach
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不确定性下的连续时间公益贡献:随机控制方法

DOI:
10.1007/s00245-016-9337-5
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发表时间:
2017
影响因子:
1.8
通讯作者:
J.H. Steg
J.H. Steg
中科院分区:
数学2区
文献类型:
--
作者:
G. Ferrari;F. Riedel;J.H. Steg

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在这篇文章中,我们研究了由所谓的公共产品贡献问题所驱动的具有单调控制和经典控制的连续时间随机控制问题。这是经济主体的问题,其目标是最大化其预期效用,在给定的时间段内,在私人消费和不可逆转的贡献之间分配初始财富,以增加某些公共产品的水平。我们研究了相应的社会计划者问题和代理人之间的战略互动的情况下,即公共品贡献游戏。我们证明了社会计划者的最优策略的存在性和唯一性,我们用随机Kuhn-Tucker条件刻画了它的充分必要性,并给出了它的表达式,表示为一个随机倒向方程的唯一可选解。类似的随机一阶条件被证明是非常有用的研究任何纳什均衡的公共利益贡献的游戏。在对称的情况下,他们允许我们证明(定性)的唯一性的纳什均衡,我们再次构建作为唯一的随机向后方程的可选解决方案。最后,我们还提供了一个详细的分析,所谓的搭便车效应。
In this paper we study continuous-time stochastic control problems with both monotone and classical controls motivated by the so-called public good contribution problem. That is the problem ofneconomic agents aiming to maximize their expected utility allocating initial wealth over a given time period between private consumption and irreversible contributions to increase the level of some public good. We investigate the corresponding social planner problem and the case of strategic interaction between the agents, i.e. the public good contribution game. We show existence and uniqueness of the social planner’s optimal policy, we characterize it by necessary and sufficient stochastic Kuhn–Tucker conditions and we provide its expression in terms of the unique optional solution of a stochastic backward equation. Similar stochastic first order conditions prove to be very useful for studying any Nash equilibria of the public good contribution game. In the symmetric case they allow us to prove (qualitative) uniqueness of the Nash equilibrium, which we again construct as the unique optional solution of a stochastic backward equation. We finally also provide a detailed analysis of the so-called free rider effect.
搭便车和不确定性
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