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138****8878    2021-09-14 12:54:53    

怎么做

187****5764    2021-09-14 11:40:09    

B为什么不对啊

13790722023@163.com    2021-09-13 13:57:15    

这题好难理解呀，操作var-el=var有说过吗？还有大于95%的除了10w还有6w吗？为什么wcl不是等于16w呢

139****6696    2021-09-13 11:34:42    

Buy call: -4 Sell put: (30-27)-3 = 0 Total profit: -4 这个答案的意思是buy call算-4是什么意思，不用考虑（30-27）吗？我的计算结果是max(0,30-27)-4+max(27-30)-3=-4,数字结果一样，但过程不一样

139****6696    2021-09-13 11:25:47    

The easiest thing to do is to find the net profit or loss for each position and then add them together, recognizing whether a position is short or long. Net profit of the long $43 strike put position: Max(0, 43 - 19) - 6 = 18 Net profit of the short $37 s

139****6696    2021-09-12 17:35:46    

Which of the following is about the upside and downside of the strategy?请问老师这里讲的upside和downside是什么意思，有些题说upper bound和lower bound，还有的题是profit，还有的题是payoff，请老师给解惑一下。

175****7743    2021-09-12 16:10:21    

请问一下theta 为什么不选

139****6696    2021-09-12 15:49:39    

Bear spreads are those in which an option trader buys a high strike call option and sells a lower strike call. 是否可以是 buy high strike put and sell lower strike put？

187****5764    2021-09-12 15:41:48    

B为什么错了

139****6696    2021-09-12 10:48:25    

An investor is decided to buy a call option with a strike price of $45 for $5 and buy a call option with a strike price of $55 for $1, simultaneously sells two call options with a strike price of $50 for $3, when the stock price turn to be $30, what is th