reading11课后题28题那个均值复归线哪里来的

请问老师，第二题，跨期替代率为m，之前说的m=P0;expected future price of a risky asset为P1，那么P0=m应该和P1是正的相关性才对啊（因为P0=P1/(1+l+Rp)），为什么答案选A？我的理解哪里有问题？谢谢

为什么ln(1+r)=r

老师 12题的C怎么知道du和dl的？

从unrealized profit500可以知道 un.real是3/4~ 这个3/4的比例不太理解从哪里来 ，跟net income对比来的吗？

这里的前提得加上：这是非同一控制下的企业合并。 因为如果是同一控制下的企业合并是不产生新的商誉的。

老师 一般情况下 ：什么时候用参数法算var?什么时候用蒙特卡洛模拟？

An Australia-based fixed-income investment manager is deciding how to allocate herportfolio between Australia and Japan. (As before, the AUD is the domestic currency.)Australia’s one-year deposit rate is 5%, considerably higher than Japan’s at 1%, butthe Australian dollar is estimated to be roughly 10% overvalued relative to the Japaneseyen based on purchasing power parity. Before making her asset allocation, the investmentmanager considers the implications of interest rate differentials and PPP imbalances. 1.All else equal, which of the following events would restore the Australian dollarto its PPP value? A.The Japanese inflation rate increases by 4%. B.The Australian inflation rate decreases by 10%. C.The JPY/AUD exchange rate declines by 10%. 答案为什么选C，希望老师解答下，谢谢

If uncovered interest rate parity holds, today’s expected value for the JPY/GBP currencypair one year from now would be closest to: A.126.02. B.129.67. C.130.05. A is correct. If uncovered interest rate parity holds, then forward rate parity willhold and the expected spot rate one year forward is equal to the one-year forwardexchange rate. This forward rate is calculated in the usual manner, given the spotexchange rates and Libors: Se=F=129.67( 1.001 1.03 )=126.02 为什么说uncovered interest rate parity holds, then forward rate parity willhold？

麻烦老师讲解下第二题和第四题，不是很理解对应的知识点；答案分别是C,B