Qu'est-ce que « Designated market maker and supplemental liquidity provider » ?

A designated market maker is the member assigned to a listed security with obligations to maintain a fair and orderly market in it, including its opening and closing auctions, in return for information and allocation privileges. A supplemental liquidity provider is a member that commits to quoting assigned securities competitively for a minimum share of the day, in return for enhanced rebates, without the designated maker’s other duties.