Don't panic, but your 401k may depend on Beijing's monetary policy.
Global stocks plunged on Monday, with the Dow making its worst start to a year since 2008.
The Dow Jones industrial average rose 1.47 percent to 16,284.7.
The Nasdaq composite and S&P 500 both dropped more than 2 percent.
Major indexes fell almost 3 percent.
China's manufacturing sector shrank at its fastest pace in three years.
In August, the S&P lost 6.3 percent, the Dow fell 6.6 percent and the Nasdaq declined 6.9 percent.
The Dow Jones industrial average rose 312.94 points to 15,979.38.