问题如下：
Which of the following statement about
repurchase agreements is NOT correct?
选项：
A. Repurchase agreements or repos are matched
pairs of the spot sale and forward repurchase of a security.
The forward repurchase price of the security
is determined at the end of the agreement.
Repo investments pay a short-term rate without
sacrificing much liquidity or incurring significant default risk.
In some cases, the repo agreements may also request a margin call from borrowers. When collateral declines in value, additional collateral is needed, when market outperforms, excess collateral can be withdrawn.
解释：
考点：对Repurchase Agreements的理解
答案：选项B描述错误，本题选B
解析：
B选项错误，在Repos中，未来的Repurchase price在期初就已约定好：Both the spot
and forward price are agreed now, and the difference between them implies an
interest rate.
D里面这个抵押品不能撤回吧？
