Position Greek = (+/-) Quantity * Percentage Greek. If we are short a call option, then we are short position delta and short position gamma. If we are short a put option, then we are long position delta (ie, negative quantity * negative delta = positive) and short position gamma (ie, negative quantity * positive gamma = negative). To be short gamma is to be exposed to large jumps; aka, short volatility.
David's XLS is here: https://trtl.bz/2tIZxr7
David's XLS is here: https://trtl.bz/2tIZxr7
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