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Investor heterogeneity, asset pricing and volatility dynamics

机译:投资者异质性,资产定价和波动动态

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摘要

We provide an explicit characterization of the equilibrium when investors have heterogeneous risk preferences. Given market completeness, investors can achieve full risk sharing. Thus, a representative agent can be constructed, though this agent's risk aversion changes over time as the relative wealths of the individual investors change. We show that volatility depends on the covariance of aggregate risk aversion and stock returns. We find that heterogeneity increases volatility, produces volatility clustering (ARCH effects) and "leverage"-like effects. Option prices exhibit implied volatility skews. There is predictability and we assess the magnitude of investors' hedging demands and trading volume. Further, diversity is beneficial to all agents and entails welfare gains that can be substantial.
机译:当投资者具有不同的风险偏好时,我们提供了均衡的明确特征。鉴于市场的完整性,投资者可以实现全部风险分担。因此,尽管随着个体投资者相对财富的变化,该代理的风险规避会随着时间而变化,但仍可以构建代表代理。我们表明,波动率取决于总风险规避和股票收益的协方差。我们发现异质性增加了波动性,产生了波动性聚类(ARCH效应)和“杠杆”效应。期权价格表现出隐含的波动率偏差。有可预测性,我们评估投资者对冲需求和交易量的大小。此外,多样性对所有行动者都有利,并带来可观的福利收益。

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