Wall Street set to open lower after four-day run of gains

Wall Street was set to open lower on Monday after the S&P 500 and the Dow recorded their first four-day winning streak in about five months last week. European stocks fell as a drop in copper prices hurt shares of mining companies, while China's reassurances over the weekend about the strength in its economy helped push Asian stocks higher. The Dow Jones industrial average closed above 17,000 for the first time since January, while the S&P 500 was just shy of 2,000, levels that traders c