I have a question about option MM's. This probably pertains to all MM's, but because of the specifics (see below) I've only noticed it with options. Consider a very thinly traded option. There's only the MM's prices, say 5.50/6.00. I put an order to sell at 5.90 and all the 6.00's dissappear. I leave it there for an hour, maybe two, wait for the MM to go for lunch, whatever, then delete my ask. INSTANTLY the 6.00 ask is back. I've tried this a bunch and it has always been instantaneous. So what's the deal here? Are the MM's using an automatic spread creating program of sorts or are they just that quick? What do they use as a model to make the market for each contract? Anybody know where I can find out the inner workings of option MM's? - The New Guy PS. I know this is a very rookie question and I'm prepared for all the flaming that's on it's way!