Systems and methods for transacting business over a global communications network such as the internet

A business process is described for conducting business transactions over the Internet, allowing buyers an opportunity to reduce the price of a product/service based on the buyer's performance during a Price-Determining-Activity (PDA). Sellers offer the product/service within a specified price range, and buyers agree to a binding agreement, in exchange for the opportunity to close the transaction at the lowest price by achieving a high score or performance during the PDA. The price may change during the PDA, and the available price at any given time may be displayed or otherwise made available to the buyer. The price change may be continuous, at intervals, in response to certain events. The PDA may be a video game, electronic board game, sports bet, card game, or any other activity, or against the seller, a software opponent, or a computer opponent. The PDA may involve another buyer competing for the same product/service.