Earlier quoted context omitted.
Market maker: guy who makes money standing in the market all day so that when you come, you don't have to wait hours for a dude who wants to buy your shipment of pork. Broker: offers you access to the market, and often lends you money as well. Needs scale, is often a lot of marketing, both in getting the customers, and in getting the customers to actually trade. Hedge Fund: Umbrella term for an investment company tha…
So, I am really an outsider to all this, but it's amazing to me that a market maker is a thing. Like, why is that guy not replaced by a computer? They never get tired, and they don't screw up. (usually)
For all the things that are "guy" above, computers are heavily involved.