More signs of slowing economic growth in China weighed on prices for copper and other commodities Monday. That sent prices for materials stocks lower. Energy stocks fell along with the price of crude oil.
The Dow Jones industrial average slipped 80 points, or 0.5 percent, to 16,352 as of 11:45 a.m. Eastern time.
The Standard & Poor's 500 index gave up 10 points, or 0.6 percent, to 1,950.