September E-mini S&P 500 Index futures are edging lower early Friday as investors look to close out the week with a gain. The benchmark index is currently trading on the strong side of a short-term retracement zone at 7540.50 to 7504.25, but more importantly, the 50-day moving average at 7504.25.The support base is there for a breakout to the upside, but the price action suggests investors are waiting for a clear-cut catalyst to set in motion the next leg up. With support clearly established, traders are no ...