Wall Street set to open higher as rate hike concerns ease

U.S. stocks were set to open higher on Wednesday, a day after comments by Federal Reserve Chair Janet Yellen allayed concerns that the central bank would take an aggressive approach to raising interest rates this year. Yellen, who made her first remarks since the Fed's meeting earlier this month, said inflation in the United States had not yet reached sustainable levels amid risks posed by uncertainty about China's economy and low oil prices. Yellen's stance contrasts with recent comments from o