The S&P500 is an index of some of the best performing companies in the US. Their performance isn't completely correlated with the broader market. Additionally,

The S&P500 is an index of some of the best performing companies in the US. Their performance isn't completely correlated with the broader market. Additionally, this damage to the economy is not permanent, most companies in that index will survive and continue to / return to paying dividends for a long time going into the future.