The Bourse set up a category of “supermarket makers,“ which should ensure a 50% higher liquidity than a classical market maker. In exchange, they will pay a fee of only 0.005% on market making transactions and will be allowed a spread 0.25% higher than a common market maker.
Market makers ensure, on their own expense, sale and buying orders for a certain minimum volume of shares, which guarantee investors, in any moment, a counterparty is willing to buy or sell the shares. Brokers have certain restrictions on the profit they can get from spread, the difference between the sale and buying quotations. For this service, the bourse gave brokers preferential fees.
(English version by Manuela Panescu)