RE: re all buys16 May 2018 12:17
mt, I'm not sure I understand your last paragraph:
"The market makers make money by ensuring that their average selling price is above their average purchase price so when they sell a lot of shares they have to take the price lower to be able to purchase the shares back again at a lower average purchase price."
My understanding was that if they sold a lot of shares, then they would have to raise the price rather than lower it in order to encourage people to sell shares back to them. The effect of the bid-offer spread is that they are almost always buying back shares at a lower price than what they are currently selling them for so they are always making a profit no?