Based on your financial expertise, provide your response or viewpoint on the given financial question or topic. The response format is open.

Does a market maker sell (buy) at a bid or ask price?
The answer posted by Kirill Fuchs is incorrect according to my series 65 text book and practice question answers. The everyday investor buys at the ask and sells at the bid but the market maker does the opposite. THE MARKET MAKER "BUYS AT THE BID AND SELLS AT THE ASK", he makes a profit form the spread. I have posted a quiz question and the answer created by the Financial Industry Regulatory Authority (FINRA). To fill a customer buy order for 800 WXYZ shares, your firm requests a quote from a market maker. The response is "bid 15, ask 15.25." If the order is placed, the market maker must sell: A)   800 shares at $15.25 per share. B)   800 shares at $15 per share. C)   100 shares at $15.25 per share. D)   800 shares at no more than $15 per share. Your answer, sell 800 shares at $15.25 per share., was correct!. A market maker is responsible for honoring a firm quote. If no size is requested by the inquiring trader, a quote is firm for 100 shares. In this example, the trader requested an 800-share quote, so the market maker is responsible for selling 8 round lots of 100 shares at the ask price of $15.25 per share.