RE: Better20 Feb 2023 20:27
@Toukankahmoon - I'll have a go at answering your question, but it's a little complicated so the answer won't be short. What follows is also somewhat over-simplified in that it considers only online quotes for trades upto the EMS (5k shares for AVCT). Anyway....
The first point to note is that AVCT has multiple market-makers. They are competing with each other for flow, so they don't collaborate in the way implied in your post. They don't have collective objectives and they don't work together as a cohesive group despite what you might read on the LSE discussion forum. In fact they are generally bitter rivals, each keen to put one over on the others.
Each MM is required to maintain executable quotes through at least 90% of the session, each with a spread below the maximum permitted - typically 5%.
When the market spread is (say) 166-172p what you are seeing is the best (ie highest) bid from across the full panel of MMs and the best (ie lowest) offer from the same panel.
Let's assume (for the sake of illustration) that this is because all 7(?) MMs are quoting 166-172p, all with the same 6p or 3.6% spread. Now consider what happens if ONE of the MMs decides that they are a little too long, so moves THEIR quote up to 168-174p. Another market maker decides that they are a little short of shares, so moves their quote down to 164-170p.
The market spread is now 168-170p, which is closer to what we are used to seeing. The MM on the offer at 170p will fill all the buys, and the MM on the bid at 168p will fill the sells until something changes.
Think about what this means... No individual MM can widen the market spread by moving their own bid/offer prices. An individual MM can only narrow the market spread by showing higher bids or lower offers. It is an elegant balance that works in investors favour.
When the quoted spread looks wide (as it was at 6p today) it's generally because all of the MMs are showing prices in the same area. None are acting to narrow the quoted spread by showing better (higher) bids or lower offers. This situation typically doesn't endure as any of the MMs can win whichever side of the flow they'd prefer to have with only a small change in the prices they are showing.