U.S. stocks fell on Monday, dragged down by commodity-linked shares as crude prices fell to fresh 5-1/2 year lows and a strong dollar also weighed on metals prices.
Crude oil futures prices dropped to their lowest since May 2009 amid a global supply glut and lackluster demand. Russia's oil output hit a post-Soviet high last year, and Iraq's oil exports in December were highest since 1980.
The strength in the U.S. currency is putting even more pressure on dollar-denominated commodities. A measure of the greenback against a basket of major currencies hit its highest since December 2005.