If the ask doesn't move, and the bid doesn't move, orders will happen at both prices due to market orders from both bears and bulls; if you'd like to call that

If the ask doesn't move, and the bid doesn't move, orders will happen at both prices due to market orders from both bears and bulls; if you'd like to call that "price moving" you're free too, but I won't. If you were staring at a chart you'd see nothing happening at all because charts don't chart orders, they chart the bid and ask or some middle between them. Regardless, you get my point, the bid and ask do not have to move at all for a market maker to make money, they would in fact prefer the safety of no directional movement.