Firm quote

A firm quote includes a bid and ask price at which a market maker is willing to trade a specific quantity - 100 shares of stock, for example.

For example, a firm quote of 42.50/42.70 means that the market maker will pay $42.50 for 100 shares and is willing to sell them for $42.70. But those prices would not apply to trades larger than 100 shares. Then prices would have to be negotiated.