Stocks started the week in the red, with the Dow Jones Industrial Average pulling back further from the record highs it set early last week. The broader market fell even more, and the technology sector found itself particularly hard hit by concerns about the sustainability of the bull market. Comments regarding the potential course of U.S. interest rates also weighed on sentiment among investors, especially because worries have already surfaced about whether the tightening that the Fed contemplates could prove too much for the economic recovery to bear.