Patent ID: 8321331

Claim:
A non-transitory computer readable medium having instructions stored thereon, which when executed cause a processor to execute acts comprising: displaying a plurality of axially aligned price levels, the plurality of axially aligned price levels representing a combined value to buy or sell a first tradable object and a second tradable object, where the first tradable object and the second tradable object are different tradable objects; displaying an order entry region comprising a plurality of order entry locations, each order entry location of the plurality of order entry locations corresponding to at least one of the axially aligned price levels; receiving a user-selection of one of the plurality of locations via a single action; and in response to receiving the user-selection of one of the plurality of locations, initiating submission of any of at least one trade order for the first tradable object, the second tradable object, or both the first tradable object and the second tradable object, where an order quantity of the at least one trade order is allocated between any of the first tradable object, the second tradable object, and both the first tradable object and the second tradable object according to a quantity allocation rule.