Jefferey: I'd like to pay this cheque in, please order erextra "If the U.S. defaults, the gains on these shorts would beastronomical," says Cliff Caplan, a wealth manager at NeponsetValley Financial Partners in Norwood, Massachusetts. Herecommends buying the ProShares UltraShort 20 Year Treasury ETF if you expect the United States to default on its debt.The ETF, which has an expense ratio of 0.93 percent of assets,is up 21.09 percent so far this year through Oct. 9. That'scompared to a 1.94 percent drop for the Barclays U.S. AggregateBond Total Return Index, which is a proxy for the U.S. bondmarket, according to Lipper, a unit of Thomson Reuters.