RE: 1p4 Dec 2020 10:01
Costs are involved for the MM offices for each trade so little trades have to be at a premium.
I worked as a dealer on the market floor when the octagons were used and any small trade was charged outside of quoted price. Market quotes are for an up to amount and here I believe it is 200,000 normally, so the quote widens if more are being dealt. Works both ways.