Bloomberg/Getty Images The S&P 500—the Standard & Poor's 500 Index—is considered to be one of the best measures of U.S. stock market performance, tracking 500 of the largest and most stable ...

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The S&P 500 Index will rise through the end of next year amid continued US economic expansion and earnings growth, according to Goldman Sachs Group Inc.’s chief equity strategist David Kostin.

Another Wall Street strategist sees the S&P 500 (^GSPC) gaining by a double-digit percentage over the next year. On Monday night, Goldman Sachs chief US equity strategist David Kostin initiated a ...