SPXW Options..Why Don't MM's just tighten the spread already? SPY weekly options usually runs 1 to 2 cents spread vs 20 to 40 cents on the SPXW options. If they went to 10 to 20 cents on SPXW there would be parity. Wouldn't the volume just flood over to SPXW if the spreads were equal? What's the hang up??