| Market makers are in the business of selling liquidity. They're saying "maybe no one else wants to buy/sell this stock but here I am and I always have a bid/ask on the table." You don't have to trade with them. But a lot of people do every day. Why do you think those people are trading with market makers if they're doing such shady things? I don't think you really understand the business that market makers are in. They aren't in the business of trying to front run people. They're in the business of making a penny a share on all the trades that go back and forth. But they face a big risk. When they're busy buying/selling for $50.00/$50.01 what happens when a big & smart hedge fund guy comes along who has new information and knows the price should really be $50.10. They try to buy up as many shares as possible at $50.00 and suddenly the market maker is fucked because they're no longer market making in a stable market. So the market maker has this big challenge where they have to do a good as job as possible detecting the big & smart hedge fund guy and quickly adjusting the price so they don't get squashed. If they can't do a very good job they have to increase spreads so they make more money in the steady state to make up for their bigger losses. If they do a really good job in this detecting they can lower spreads. It turns out that HFTers are really good market makers. You can see this because they've successfully competed against each other to the point that they can lower spreads all the way to a penny (a 10x reduction of where they used to be!). When you look at it this way you can see that market makers aren't trying to screw the big traders, they're trying to avoid getting screwed so that they can better serve everyone else by offering lower prices (lower spreads). The nice side effect of all of this is that price information gets better communicated to the market faster. If you happen to be randomly selling your MSFT when Mr. Big & Smart shows up you're more likely to get the best possible price due to all the information being correctly communicated to the market. |