请问老师，这里借现货抛后，得现金买期货，怎么还有资金投资无风险资产？

老师，这里问的是effective duration，也可以用定义式来做吗？我理解应该用p大-p小那个公式做

Suppose you believe that Company A's stock price is going to decline from its current level of $82.50 sometime during the next 5 months. For $510.25 you could buy a 5-month put option giving you the right to sell 100 shares at a price of $83.00 per share. If you bought the put option contract for $510.25 and Company A's stock price actually dropped to $63.00, your profit net of the premium paid would be: A $1,950.00 B $1,439.75 C $1,489.75 D $2,000.00 老师请问这一题不用考虑时间价值什么的吗？

bsm中 nd1 nd2 与行权概率以及delta对应关系怎么理解？

为什么没加括号，不是应该S-D-X的结果折现吗

请问老师答案中为什么是32/180呢

为什么enron在财报上是有利润的？ 现金流是负的呀

90ti该怎么做

这题该怎么做

这道题怎么做？