mp3bu

Thanks bannisja. You are right bid is 40 and ask is 42.

In my experience, when I put in a sell order of 41.50, very likely mm will match that (I can tell by the sell size). Also If I cancel my order, the ask will likely go back to 42 immediately. So what do you call this? What is the motivation of mm?

If someone hits the ask of 41.5, whose order will be filled? If it is my order, why mm match up my order at the first place?

What if I withdraw the 41.5 sell order after seeing 41.5 ask will stay and then immediately buy at 41.5? I.e., my motivation is clear - lower the ask with no real intention to sell, is this still ok?

I do not want to post inside limit buy order because I fear the ask will be raised.