The head of US equity derivatives strategy at UBS said she expected the S & P 500 to fall at least 10 per cent from its peak within a month. "I am tactically bearish on the next two months," Rebecca Cheong wrote in a note to clients on Tuesday. "The slightest bit of disappointment in the economic data to be released could trigger a major pullback." She advised investors to buy tail hedges of ETFs to protect against losses, and put the iShares Russell 2000 ETF (IWM), the Financial Select Sector S...