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The ATM is an outright position (long 50 delta put and 50 delta call) so the main exposure is vega. It is the riskiest of the three, and demands a higher bid-offer spread from market makers to compensate them for the additional risk. The RR is a spread position (long 25 delta call, short 25 delta put) with zero vega, the main exposure is skew. Because the ...

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