Non-spanning expiries identify the no-event volatility surface while event-spanning quotes calibrate deterministic-time jumps, yielding better held-out pricing for SPX options around macro events than surface-absorbing or amortized alternatives.
Hutchinson, Andrew W
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Non-Spanning Identification of Scheduled Event Risk in Option Pricing
Non-spanning expiries identify the no-event volatility surface while event-spanning quotes calibrate deterministic-time jumps, yielding better held-out pricing for SPX options around macro events than surface-absorbing or amortized alternatives.