The stock market spiked suddenly on Monday amid a fury of dip-buying.
The S&P 500 was up 2.1% after trading sharply lower earlier in the morning. The Dow was up 370 points, or 0.7%. The Nasdaq Composite rose 2.2%.
Stocks were rallying across the board: Only 47 S&P 500 stocks were down—a stunning reversal from a half-hour ago when all but three stocks were falling.