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I used to trade voice before I went full algo. They know, and they go for drinks with them after work. They're supposed to not tell you because the whole point of them is to be the go-between, so that it's not too obvious what they want to do.

That sort of broking is a lot smaller now, and there is something to be said for the screen model of market making.

Each broker goes for drinks with their clients, and knows what their client trades. But they can rarely connect the dots without the help of a market maker. Hence why I got drinks :)

Former broker.

We know, but it is important function of a broker not to tell.

In my experience they do know. Not every broker, not every trade you might ask about. Still even if your broker doesn't know, if there's enough guys on your trade floor someone is going to be able to call or message someone who does know. No going out for drinks needed, fuck that.