<t>Thanks for your reply.But I still have another question.If I long a 1-month call, and the spot goes up and then down, I could take profit form gamma trading.( because I buy thr underlying at lower price and sell them at higher price)But if the spot goes up and up, I will sell more and more underl...

<t>I am a little confused about gamma trading.1.If I just long an option and let it alwayse be delta neutral, does it mean gamma trading?2.If spot moves up and down , I will gain(loss) form delta neutral and loss(gain) from option value. Dose I alwayse make money through delta neutral?3.If spot just...

in fx optionif i know 1 week 10 delta and 25 delta volatility and 1 month 10 delta and 25 delta volatilityhow to calculate 2 week 15 delta volatility?

<t>i have try to use close form to price fx barrier option, but it is just theoretical value. i'd like to know how to take hedging cost into account to calculate market value. i have read some paper, it usually refer to use replication method, which adopt vanilla option to replicate vega, volga and ...

<t>When we try to price barrier option,we alwayse use close form.The trigger probability is implied from these equations.But when we calculate barrier option, these equations are combined to calculate one single value.I really don't know how to decompose these equations to calculate trigger probabil...