RE: Buys ir sells13 Nov 2024 11:54
But the ACTUAL price paid - or received is irrelevant - everyone involved in a transaction KNOWS if it is a buy or a sell.
I fear we won't progress this much, but I kind of agree that the price paid is irrelevant as to whether it's a buy or sell, but if you reference the price paid to the spread at the time the sale transacts, then you can make an assessment of whether it was demand or supply driven. That in theory gives you information as to whether you should classify it as a buy or a sell. In reality the info is very flawed, so why not just stick to the impact that transactions have, over whatever you timeframe of interest is, on SP? That data is real and in theory should be unequivocal (I'd imagine there are complications that sometimes mean that's not exactly true, but more or less it should be)?
How else can the MM's make the market (i.e. facilitate the trades, other than moving the spread to bring buyers and sellers who were static in their positions, together? That's what they do, and the profit they take is based on volume. They don't typically like to hold stock, they buy it at one price and as quickly as possible sell it at a higher price. When they hold it, they risk being on the wrong side of the SP and have a real risk of making losses. They get paid, because of that risk. They're normally very good at what they do and will mostly make a profit, but it's not guaranteed.
I suspect the big players don't have anything better than the SP to go on, except they will have more acces to info on off-book activity. That info on positioning of smart ('large') money is more useful to them than what we do as 'small' or 'dumb' money. I mean retail by that and don't want to imply a perjoritive view.