In the latest Market on Close livestream, Senior Market Strategist John Rowland gave traders a heads-up to keep an eye on one of the market’s most watched technical lines — the 50-day moving average. The S&P 500 Index ($SPX) and SPDR S&P 500 ETF (SPY) have both rallied sharply over recent months, but that momentum may be about to face its biggest test yet. More News from Barchart “We’ve had a lot of new length purchased in a very short period,” John said. “The 50-day moving average is acting as support ...