Here are the levels where key indexes would need to close to enter bear territory, according to Dow Jones Market Data:
S&P 500 SPX, -7.59% — 2,708.92
Dow Jones Industrial Average DJIA, -7.78% — 23,641.14
Nasdaq Composite COMP, -7.28% — 7,853.74
Stocks fell sharply Monday, triggering a...