NO.PZ2019012201000074
问题如下:
Ap learns that
Chiyodasenko has initiated a new equity fund. It is similar to Fund 1 but
scales up active risk by doubling all of the active weights relative to Fund 1.
The new fund aims to scale active return linearly with active risk, but
implementation is problematic. Because of the cost and difficulty of borrowing
some securities, the new fund cannot scale up its short positions to the same
extent that it can scale up its long positions.
Relative to Fund
1, Chiyodasenko’s new equity fund will most likely exhibit a lower:
选项:
A.information ratio
idiosyncratic risk
collateral requirement
解释:
As the new fund
scales up active risk by doubling active weights, it will face implementation
constraints that will prevent it from increasing the weights of many of its
short positions. The information ratio (IR) is defined as the ratio of active
return to active risk. If there were no constraints preventing the new fund
from scaling up active weights, it could scale up active risk by scaling up
active weights, proportionally increase active return, and keep the IR
unchanged. Implementation constraints experienced by the new fund, however,
such as the cost and difficulty in borrowing securities to support the
scaled-up short positions, will prevent the active return from proportionally
increasing with the active risk. Therefore, the IR would most likely be lower
for the new fund than for Fund 1. As the following chart illustrates, as active
risk is scaled up, implementation constraints create diminishing returns to
scale for active returns, thereby degrading the IR.
知识框架图85页:limitations of returns achieved by bearing risk下面有三点
- implementation constrains属于IR 相对风险
- limited diversification opportunities
- leverage beyond volatility reduces expected returns
我记得李老师在基础班说2和3是和sharpe ratio绝对风险有关的。
如果上述正确,那么题目会不会让区别是IR还是sharpe ratio?谢谢