When you look at L2, they show how many they are willing to trade. So if it's 10k at 025 and the next mm had 30k at 026, for instance, you putting in a buy for 20k at a limit of 025, you get nothing unless the 2nd mm drops his price. If you put a buy in at Market value for 20k, you get 10k at 02 5 and then 10k at 026.