Systemic Portfolio Diversification
研究银行在考虑抛售溢出损失时的投资组合选择问题，发现最优资产配置是潜在博弈的唯一纳什均衡，并揭示了个体多样化与系统性风险之间的关键权衡。
We study the portfolio choice problem of banks, taking into account losses due to fire-sale spillovers. We show that the optimal asset allocation can be recovered as the unique Nash equilibrium of a potential game. Our analysis highlights the key tradeoff between individual diversification and systemic risk. In a stylized model economy featuring two banks and two assets, we show that sacrificing individual diversification to reduce portfolio commonality increases the likelihood of a sale event, while simultaneously decreasing the probability of a costly systemic sell-off. Banks have stronger incentives to achieve systemic diversification if there is more heterogeneity in leverage among them, leading to a decrease in the overall vulnerability of the system. We provide numerical evidence that our conclusions are robust with respect to the number of banks and assets in the system. Funding: The research of A. Capponi has been supported by the NSF/CMMI CAREER-1752326 award. The research of M. Weber has been supported by the NUS Start-Up Grant [A-0004587-00-00].