1. A system comprising: a data unit configured to receive data from at least one data source, the received data being historical data related to pricing of a subject item; a visualization unit configured to display numerical data related to the subject item and a chart graphically representing an initial transaction strategy for the subject item; and a selection unit configured to receive a first user manipulation of the chart; the visualization unit being further configured to update the numerical data in response to the first user manipulation of the chart.