U.S. Markets close in 47 mins

Getting technical: AlphaTrends SPYs on bulls and bears with anchored VWAP

It's do or die for stocks. Brian Shannon, CMT and founder of www.alphatrends.net joins Yahoo Finance's Jen Rogers and Myles Udland to break down the action in the SPDR S&P 500 ETF (SPY). Two time frames tell two different stories.