Equity markets tried to build on Monday's gains but fell in Tuesday trading by the end of the session. News from Dick's Sporting Goods is among the reasons why. The Q2 report paints a bleak picture for retail; the stock fell more than 20% at the session's low. According to Dick's, rising inventory shrinkage, or theft, is cutting into the bottom line results and significantly impacting the guidance. This is not a new phenomenon but 1 that has worsened over the last 3 quarters and will continue to worsen.

Tuesday's decline in the S&P 500 is important because it showed resistance at the 30-day moving average. If confirmed, this resistance could send the index down to new lows. The next target for solid support is near the 150-day EMA, which is about 2.7% below Tuesday's close; the next target below is another 2.5% to 5% lower. The market sell-off will gain momentum if good news doesn't emerge soon.