Sell US stocks now before the S&P 500 tanks by over 20{21df340e03e388cc75c411746d1a214f72c176b221768b7ada42b4d751988996}, strategist says

Traders function on the flooring of the New York Inventory Exchange, November 16, 2010.Brendan McDermid/Reuters Exit the inventory rally now as the S&P 500 index could tumble about 22{21df340e03e388cc75c411746d1a214f72c176b221768b7ada42b4d751988996}, according…