risk position 是什么

老师你好 这个第一题价格上升概率p不应该是（92-80）/80吗 答案我有点看不懂 不懂答案怎么算出来的p

上升的概率为什么不是80%？

老师index的variance为什么比components的variance上升的更快，常理讲大盘的波动率应该没有个股的波动率大啊，我带了个数算了下 也行不通啊

期权映射模型为什么只考虑行权的情况，没有考虑不行权的情况呢？

为什么说对于期权卖方来说风险很大呢 卖方也可以选择不执行的吧 为什么说杠杆特别大

请问通常说的volatility到底是delta还是delta²，DX和VX是delta还是delta²

这里错了吧，题目是方差20%，不是标准差20%。u应该＝exp根号20%根号0.25，对吗？

老师信用风险122页这一段Another difficulty with the Merton model is that default is too ​predictable. Remember that to obtain prices of debt in that ​model, we make the Black Scholes assumptions. We know that ​with these assumptions firm value cannot jump. As a result, ​default cannot occur unless firm value is infinitesimally close to ​the point where default occurs. In the real world, default is often ​more surprising. For instance, a run on a bank could make its ​equity worthless even though before the run its equity value was ​not close to zero.没太看懂能讲一下吗？谢谢

为什么deep in the money时，gamma和vega就不考虑了