U.S. stocks closed lower Monday, as investors digested a number of corporate results, important economic data, and remarks from a Federal Reserve (Fed) official. In U.S. economic news, industrial production data showed a 0.1 percent increase in September, slightly below a consensus estimate of 0.2 percent. Meanwhile, Fed Vice Chair Stanley Fischer warned of the dangers of low interest rates, suggesting that they could lead to longer and deeper recessions, making the economy more vulnerable. The dollar dropped slightly against a basket of currencies. Light sweet crude oil for November delivery lost 0.81 percent to $49.94 per barrel on the New York Mercantile Exchange, while gold futures rose $1.10 to $1,256.60 per ounce. The Dow Jones industrial average declined 55, or 0.3 percent, to 18,083. The broader Standard & Poor's 500 index slipped 6, or 0.3 percent, to 2,127. The technology-heavy Nasdaq composite index decreased 13, or 0.26 percent, to 5,200.