Amazon delivers S&P 500 its best day in two months

Buoyed as well by higher global stock markets, Wall Street's gains appeared to breathe new life into a two-month rally that had petered out in mid-April, and left the S&P 500 with an increase of nearly 2 percent for 2016. Amazon jumped 3.43 percent to a record of $703.07, giving the biggest boost to the S&P 500 and the Nasdaq. Bernstein raised its price target on the stock to $1,000, the highest on Wall Street, saying it believes Amazon's margins will expand much faster than currently ex