如果阿根廷放弃比索并把经济完全美元化，为什么就必须向美国上交铸币税?你如何衡量阿根廷牺牲的铸币税的大小?(考虑阿根廷将其经济美元化所采取的实际步骤。你可以假定阿根廷中央银行的资产100%由美国付息国债构成。)

Why would Argentina have to give the United States seigniorage if it gave up its peso and dollarized its economy completely? How would you measure the size of Argentina's sacrifice of seigniorage? (To do this exercise，think through the actual steps Argentina would have to take to dollarize its economy.You may assume that the Argentine central bank's assets consist 100 percent of interest-bearing U.S. Treasury bonds.)