Does sustainable competitive advantage make a difference in stock performance during the Covid-19 pandemic?

Although firms with sustainable competitive advantage do not yield superior returns in regular years, these firms significantly outperform others during the Covid-19 pandemic. Empirical evidence shows that wide-moat is positively priced by the stock market during the pandemic, which is not the case in the pre-pandemic period. Furthermore, wide-moat firms can generate positive cumulative abnormal returns after the advent of the Covid-19 pandemic. However, the magnitude wanes down as time expands into the future.