The Standard & Poor’s 500 Index, better known as the S&P 500, is a commonly-referenced barometer for the investment world on how the overall stock market is performing. The S&P 500 is an American stock market index based on the overall market capitalization of 500 U.S.-based publicly-traded companies. Said another way, the larger the company, the more weight it carries in the overall valuation of the index. According to...
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