Identifying economic regimes: Reducing downside risks for university endowments and foundations

One of the most durable patterns in market behavior involves contagion-increases in correlation and volatility-during crash periods such as 2008. This condition can cause major problems for an investor when markets severely contract and anticipated diversification benefits vanish. To address contagion, the authors implement a machinelearning algorithm, trend filtering, to capture distinctive economic conditions. Over long horizons, they find that a multiregime simulation provides more accurate estimates of downside risk compared with traditional static portfolio models and can help in evaluating strategies for reducing the worstcase outcomes. The approach readily applies to nonprofit institutions that depend upon their endowment capital to fund liabilities and meet goals.