问题如下：
Which of the following statements about the“Economic Function of Markets for Collateral” is NOT correct?
选项：
A. Without the collateralmarkets, there would be no way to short a cash security; short positions couldonly be created synthetically.
B. Reverse repo transactions areused to borrow cash by owners of bonds.
C. The collateral marketsenhance the ability of firms to borrow money.
D. Margin lending is primarily used by investorswishing to take leveraged long positions in securities, most often equities
解释：
考点：对Economics of The Collateral Market的理解
答案：B选项描述错误，本题选B。
解析：
在Reverse repo transactions中，是以“买入债券”一方的视角看待的，通常是为了获得Bonds的头寸：They are used to finance longpositions in securities, typically bonds.
而Repo transactions是站在“债券卖出方”的视角看待的，目的是为了获得融资：Repo transactions are usually intended to borrow cash by owners ofbonds.
老师，A选项，我理解如果风险低，不要抵押物也可以交易，那A不就错了吗？所以还是不太能理解
