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S&P 500 If the official S&P 500 Index opening price for the S&P 500 (SPX) on July 29 is higher than the official S&P 500 Index closing price for the SPX on the previous trading day, the market will trend “Up.” If the official S&P 500 Index opening price for the S&P 500 (SPX) on July 29 is lower than the official S&P 500 Index closing price for the SPX on the previous trading day, this market will turn “Down.” For example, normally on a Monday, a market
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