老师好！short sale中，将股票变现之后，需将Cash和margin存入broker的账户。如果发生dividend，需要short seller自掏腰包支付给Lender。这个股利支付是在发生后将所产生的股利打入broker账户吗还是直接可以从卖股票变现后的现金及保证金中扣除？谢谢

老师好！题目如下： Caroline Rogers believes the price of Gamma Corp. stock will go down in the near future. She has decided to sell short 200 shares of Gamma Corp. at the current market price of €47. The initial margin requirement is 40 percent. Which of the following is an appropriate statement regarding the margin requirement that Rogers is subject to on this short sale? A She will need to contribute €3,760 as margin B She will need to contribute €5,640 as margin C She will only need to leave the proceeds from the short sale as deposit and does not need to contribute any additional funds 答案：B 为什么200*47*0.4呢？不明白，谢谢老师！

老师麻烦解释下这题

老师你好，我没太明白如何判断公司要不要提前付款这部分，可以再解释一下吗？谢谢

请问这个shelf registration 属于私募性质还是公募性质？

老师请问这里的promote 不是促进的意思吗？限制做空不是妨碍市场有效性吗？

请问开放式基金的申购和赎回都是按当时的净值来交易的吧？

I/Y是不是应该是r/m=2.5?

老师， 这道题思路可不可以是put option value=max（x-s，0）。此时如果rf上升，会导致spot price上升，从而使x-s下降？

这道题目中required rate of return是干嘛用的？