A system and method are provided for calculating and displaying volume to identify aggressive buying or selling activity. In a preferred embodiment, market information such as the inside market, last traded price, and last traded quantity is received from the electronic exchange and is used to assist a trader in determining the initiative side of a trade, either bid side or ask side. Once a determination is made, the result may be used to assist a trader analyzing the market volume. Other features and advantages are described herein.