Can I buy a V? There's some debate over the effect of the Sept. 11 attacks on a market that was already heading towards a recession. Last week, observers ruminated on Federal Reserve Chairman Alan Greenspan's observations that the U pattern of the economy may become a V as a result of the attacks a sharper downturn, but quicker recovery. Or, to major skeptics, maybe it will become a W. "Or maybe just an electrocardiogram," one loan market player suggested.