COLLECTING COMPETITIVE PRICING INFORMATION VIA A MERCHANT WEB SITE FOR USE IN SETTING PRICES ON THE MERCHANT WEB SITE

A facility for collecting pricing information is described. The facility serves a web page to a client computing system. The served web page contains a first control operable to order a selected item from a selected vendor. The web page further contains a second control operable to submit a price charged for the selected item by a vendor other than the selected vendor. At a later time, the facility receives from the client computing system information that indicates that the second control has been operated to submit a price charged for the selected item by a vendor other than the selected vendor.