This study examines the relationship between positive and negative investor sentiments and stock market returns and volatility in Group of 20 countries using various methods, including panel regression with fixed effects, panel quantile regressions, a panel vector autoregression (PVAR) model, and country-specific regressions. We proxy for negative and positive investor sentiments using the Google Search Volume Index for terms related to the coronavirus disease (COVID-19) and COVID-19 vaccine, respectively. Using weekly data from March 2020 to May 2021, we document significant relationships between positive and negative investor sentiments and stock market returns and volatility. Specifically, an increase in positive investor sentiment leads to an increase in stock returns while negative investor sentiment decreases stock returns at lower quantiles. The effect of investor sentiment on volatility is consistent across the distribution: negative sentiment increases volatility, whereas positive sentiment reduces volatility. These results are robust as they are corroborated by Granger causality tests and a PVAR model. The findings may have portfolio implications as they indicate that proxies for positive and negative investor sentiments seem to be good predictors of stock returns and volatility during the pandemic.

We examine the relationship between price stability and financial stability for major emerging economies using a Markov regime-switching model. Empirical results suggest that monetary policy is consistent with the Taylor rule in all countries except for India and all countries followed both low and high inflation targeting monetary policy regimes. Low inflation targeting regime seems to be more persistent and has higher duration than high inflation targeting regimes except for Indonesia and South Africa. All countries seem to have had financial stability concerns when they formulated their monetary policy as the coefficient of the financial stress index is statistically significant at least in one regime. Overall the results suggest that Taylor rule-based monetary policies have been implemented to various degrees in major emerging economies to achieve economic stability, price stability, and financial stability.