吴昊_品职助教 · 2020年12月01日
同学你好：
个人认为mock的答案解析表述是错误的，A选项描述的就是trading cost而不是delay cost。而C选项，从字面意思看，选择恰当的交易速度可以降低交易成本，这里说的trading cost应该就是广义的交易成本，而不再是我们IS中分解的一部分了。比如，alpha decay比较大的情况下，我们交易得更快，就可以降低交易成本。
以下三句话是我从原版书上摘录的，关于如何控制三类成本的具体做法。
Delay cost can be minimized by having proper trading practices in place to provide traders with all the information they need to make an immediate decision, such as pre-trade analysis and post-trade analysis. Opportunity cost can be reduced by knowing the order size and share quantity that is most likely to be executed in the market within a specifed price range. The trading cost component can also be effectively managed so that it is consistent with the underlying investment objectives of the fund by selecting the proper price benchmarks and trading urgency.
这道题本身出的就不是很好，IS的考法多数是以计算形式出现，同学只要掌握知识点即可，不用太过于纠结。
