假定美国利率为5％，某一拉丁美洲国家的利率为10％。现行市场汇率为每美元兑250比索。 a．如果汇

率一年内由每美元兑250比索升至兑255比索。请问是投资于美国债券有利还是投资于该拉丁美洲国家的债券有利？ b．如果利率平价成立，那么从现在起一年后的汇率将是多少？ Suppose that the U．S．domestic interest rate is 5 percent and that the interest rate in a Latin American country is 10 percent．The current market exchange rate is 250 pesos per dollar． a．If the exchange rate in one year goes from 250 to 255 pesos per dollar．is it more profitable to invest in U．S．bonds or in bonds from the Latin American country？ b．If interest—rate parity holds．what would the exchange rate be one year from now？