RE: lol Neeko14 May 2019 11:28
I've already explained that several times but there are a few posters here who haven't yet got the message. The MMs set their prices based on three factors: the flow of orders, their own book and the competition from the other MMs. They do NOT base their prices on news or expected developments, except as these are reflected in actual orders. They are not in business to make money on positions in shares; they earn their living from the spread between their buy and sell prices. In fact a good market maker always tries to keep his book flat. I'm not sure how it works these days, but I would think that most prices are set by an algorithm in a computer and not by a human and algorithms can't read RNSs. Algorithm or human, though, an MM is far more concerned with volume than he is with price. When volume goes up, profits go up, regardless of where the price is or whether it's rising or falling.
At the same time, games can be played to allow, for example, the completion of a large order or to level a badly unbalanced book or perhaps to trigger stop-loss orders (the famous tree shake) but I think these are far less common than is assumed by many. Also, some of the MM firms have divisions that do actually take positions in shares and it's not inconceivable that their MMs occasionally help them out.
My own experience goes back many years (the jobbers on the floor of the exchange kept their book using a pencil and liitle notebook), but I don't think the principles of market-making have changed all that much since then.