Spreads with the same params for Call and Put have at expiration the same payoff
Example:
Spot=2, DTE=90
Short: Strike=5, IV=150
Long: Strike=3, IV=150
Applying this to Puts gives the same payoff at expiration as for Calls.
For Calls this relation has to hold always: Premium >= max(0, Spot - Strike)
If not, then the quoted Premium is wrong/fake/fraudalent.
Ie. this formula helps to detect buggy Bid or Ask.
For Puts this relation has to hold always: Premium >= max(0, Strike - Spot)
If not, then the quoted Premium is wrong/fake/fraudalent.
Ie. this formula helps to detect buggy Bid or Ask.
...
Example:
Spot=2, DTE=90
Short: Strike=5, IV=150
Long: Strike=3, IV=150
Applying this to Puts gives the same payoff at expiration as for Calls.
For Calls this relation has to hold always: Premium >= max(0, Spot - Strike)
If not, then the quoted Premium is wrong/fake/fraudalent.
Ie. this formula helps to detect buggy Bid or Ask.
For Puts this relation has to hold always: Premium >= max(0, Strike - Spot)
If not, then the quoted Premium is wrong/fake/fraudalent.
Ie. this formula helps to detect buggy Bid or Ask.
...
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