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arXiv 2410.01352q-fin.PRq-fin.TR
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部分观测下的均场均衡资产定价模型:一种指数二次高斯方法

Mean field equilibrium asset pricing model under partial observation: An exponential quadratic Gaussian approach

Masashi Sekine

AI总结:

本文基于均场博弈理论研究部分可观测市场中异质投资者的资产定价问题,通过均场BSDE和指数二次高斯框架半解析地刻画均衡风险溢价,并利用Kalman-Bucy滤波内生构建不可观测的风险溢价过程。

摘要:

本文利用均场博弈理论研究一个具有大量异质智能体的部分可观测市场中的资产定价模型。在此模型中,我们假设投资者只能观测股票价格,并在确定交易策略时必须从这些观测中推断风险溢价。我们通过求解均场倒向随机微分方程(BSDE)来刻画此类市场中的均衡风险溢价。具体而言,通过采用指数二次高斯框架,均场BSDE的解可以半解析地表示。随后,我们利用Kalman-Bucy滤波理论,内生地构建了投资者无法直接观测的风险溢价过程。此外,我们包含了一个简单的数值模拟,以可视化我们的市场模型的动态。

英文摘要:

This paper studies an asset pricing model in a partially observable market with a large number of heterogeneous agents using the mean field game theory. In this model, we assume that investors can only observe stock prices and must infer the risk premium from these observations when determining trading strategies. We characterize the equilibrium risk premium in such a market through a solution to the mean field backward stochastic differential equation (BSDE). Specifically, the solution to the mean field BSDE can be expressed semi-analytically by employing an exponential quadratic Gaussian framework. We then construct the risk premium process, which cannot be observed directly by investors, endogenously using the Kalman-Bucy filtering theory. In addition, we include a simple numerical simulation to visualize the dynamics of our market model.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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