Abstract: A system and method host an electronic marketplace in which the initial product prices are set by the selling party and the final purchase price is determined by the time between product posting and payment from a buyer. Gamification is implemented using purchasable powerups to allow users to manipulate the prices during a product listing. The seller has two options for the increment or decrement rate of the price of the product: automatic or manual. In the automatic incrementation, the system increments or decrements the final price by cross-referencing the time and the product seller's inputted choice of UP or DOWN at the time of posting. In the manual incrementation, the seller selects the speed in which the price is increased or decreased from the start to the end of the product listing based on the seller's inputted choice of UP or DOWN at the time of posting.