 gaining more than 575 points so far today. The S&P 500 and NASDAQ composite remain mixed. The U.S. import price index was flat last month, stifled by a drop in fuel import prices, according to the Labor Department. Economists surveyed by the Wall Street Journal were expecting a 2% drop in June import prices. Over the past year, import prices grew 0.2% for the month of May. Gains have not been in that level since in 18 months' time.