Patent ID: 7512561

Claim:
A method of facilitating trading and displaying market information relating to two tradeable objects being traded on at least one electronic exchange using a graphical user interface and a user input device and having preset parameters for trade orders, the method comprising: dynamically displaying a first combined quantity indicator at a location corresponding to a first price level of a plurality of price levels on a common static price axis, the first combined quantity indicator representing quantity associated with an order to buy a first tradeable object and an order to buy a second tradeable object, wherein the first tradeable object and the second tradeable object are different tradeable objects; dynamically displaying a second combined quantity indicator at a location corresponding to a second price level on the common static price axis, the second combined quantity indicator representing quantity associated with an order to sell the first tradeable object and an order to sell the second tradeable object; displaying an order entry region comprising a plurality of locations corresponding to the plurality of price levels along the common static price axis, such that a selection of one of the plurality of locations by a single action of a user input device sends a trade order for the first tradeable object, the second tradeable object, or both the first tradeable object and the second tradeable object; establishing a plurality of quantity allocation rules to be used to allocate a preset default order quantity to determine an order quantity of the trade order; and in response to a selection of one of the plurality of locations of the order entry region, using at least one of the plurality of quantity allocation rules to allocate the order quantity of the trade order to the first tradeable object, the second tradeable object, or both the first and second tradeable object.