Fecha de publicación: -- Fuente: Wipo "digitalization" A commerce management device (1) is comprised of a transaction log; a sales quantity calculator (113) that calculates a quantity of sales of a digital product; a resell order count calculator (114) that calculates a resell order count based on a resell order form that is issued by a participant and recorded in a digital product resell order queue; and a price determiner (112) that determines the price in the next transaction by employing a monotonically increasing mathematical function that calculates a transaction price by taking, as an argument, a net quantity of sales obtained by subtracting the resell order count from the quantity of sales.