This was another day when the SDPR S&P 500 Trust(NYSE:SPY) rallied on extremely light volume. Yesterday the highly popular SPY traded over 200 million shares and the market was down sharply, however, the volume on the SPY today is just 135 million shares at 3:51 pm EST and the market is trading sharply higher. Traders must remember the old market adage that states, “never short a dull(light volume) market.”
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