The materials sector weighed on the market today, with the Materials Select Sector SPDR ETF (NYSEMKT: XLB) dropping 3.3%. Stocks seesawed between gains and losses Tuesday, with the Dow Jones Industrial Average (DJINDICES: ^DJI) and the S&P 500 (SNPINDEX: ^GSPC) edging into negative territory in the final hour. "These inflationary impacts increased during the quarter and, as a result, we experienced the highest level of cost inflation since the cycle began two years ago," said CEO Michael McGarry in the press release.