Mean Field Equilibrium: Uniqueness, Existence, and Comparative Statics

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Tác giả: Bar Light, Gabriel Weintraub

Ngôn ngữ: eng

Ký hiệu phân loại: 531.1 Dynamics, statics, mass and gravity, particle mechanics

Thông tin xuất bản: 2019

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Bộ sưu tập: Metadata

ID: 162685

 The standard solution concept for stochastic games is Markov perfect equilibrium (MPE)
  however, its computation becomes intractable as the number of players increases. Instead, we consider mean field equilibrium (MFE) that has been popularized in the recent literature. MFE takes advantage of averaging effects in models with a large number of players. We make three main contributions. First, our main result provides conditions that ensure the uniqueness of an MFE. We believe this uniqueness result is the first of its nature in the class of models we study. Second, we generalize previous MFE existence results. Third, we provide general comparative statics results. We apply our results to dynamic oligopoly models and to heterogeneous agent macroeconomic models commonly used in previous work in economics and operations.
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