原题
If interest rates are unchanged over six-month period, what is the effect on the leveraged portfolio compared to the unleveraged portfolio return.
问leveraged portfolio return跟unleveraged portfolio return相比会怎样？
何老师在课后题讲解的时候讲，interest rates are unchanged的话投资回报就为0。
这句话我不太理解，投资不就是去拿钱买bond吗，interest rate不变的话，投资回报不就是不变吗？为啥会等于0呢？