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S&P 500 (SPX) Opens Up or Down on April 23?

This market will resolve to "Up" if the official S&P 500 Index open price for S&P 500 (SPX) on April 23 is higher than the official S&P 500 Index closing price for SPX on the most recent prior trading day. This market will resolve to "Down" if the official S&P 500 Index open price for S&P 500 (SPX) …