Long Memory and Asymmetric Uncertainty Effects on Stock Returns and Volatility: A Fractional Integration Approach
This paper investigates how Economic Policy Uncertainty (EPU) affects the returns and volatility (proxied by squared returns) of 448 S&P 500 stocks over the period January 2010–December 2020, and whether volatility persistence is related to EPU sensitivity. Persistence is measured with three semiparametric estimators o...