so I've been trading for some time but never needed to know all the various ways to add liquidity or get filled in certain ways. therefore, I have a couple of questions: lets assume the current spread is bid: 19.99, ask 20:00 the posted market price is 19.995 I know I can place a buy-limit order for 17.00 19.98 19.99 19.994 and that these count as adding liquidity. but what about 19.995 19.997 20.00 20.001 <b>Can I go above the midpoint and have that count as adding liquidity? Can I match an order from the ask side with a limit order and have that count as adding liquidity? Can I place a buy-limit order above the ask at all? </b> I've done all these things before but I never cared to examine it (if I got filled I got filled)