when a currency crisis occurs, in an emerging country, its central bank may react by increasing the policy rate sharply, 高利率会形成forward discount,但forward discount应该是contango有positive rolling yield并且导致decrease in hedge cost,和之前做题记得笔记是相反的,也和常识是反的,可以麻烦老师帮忙理一下逻辑吗?谢谢。