Market Extra: Stock-market rout: Why did rising coronavirus cases catch investors by surprise?

Stocks are headed for their worst week since March, but the pandemic never went away, and the threat of an autumn rebound in cases as cooler weather returned was long identified as a potential risk.

Stocks are headed for their worst week since March, but the pandemic never went away, and the threat of an autumn rebound in cases as cooler weather returned was long identified as a potential risk.