US Patent 7406444 Order price threshold for automated market system

A method for trading a security in an electronic market includes entering an order at a client station for executing against any market participant that can at least in part satisfy the order, determining a threshold for executing the entered order based on an inside price of the security in the electronic market, matching a portion of the entered order at a server system against interest in the market that does not exceed the determined threshold, and returning any unmatched portion of the entered order that can not be matched by the interest in the market without exceeding the determined threshold.