The S&P 500 index and the Dow eased on Friday after a steep drop in oil prices pressured energy stocks, but losses were limited by gains in chipmakers and retail stocks. U.S. crude declined 4 percent to settle at $67.88 per barrel after Saudi Arabia and Russia said they were ready to ease supply curbs that have pushed prices to their highest since 2014. The S&P energy index .SPNY slid 2.9 percent, while Chevron (CVX.N) dropped 3.7 percent and Exxon Mobil (XOM.N) fell 2.1 percent and were the biggest drags on the Dow. “It’s been a very rough week for oil, and that has weighed (on part) of the market. And the ... (full story)