1)in a global portfolio, the depreciation of one currency ** often offset by the appreciation of another. 2)market and currency r**k are not additive (only true if the two are perfectly correlated). 3)the exchange rate r**k of an investment may be hedged for major currencies by selling futures or forward currency contracts, buying put currency options, or even borrowing foreign currency. 4)contribution of currency r**k decreases with the length of the investment horizon.既然你双学位应该知道答案了,还是把分给我呗 20210311