Abstract: A method and machine to provide a flexible pricing approach for one or more sellers and multiple buyers with a demand and time dependent real-time bid acceptance engine to work together to increase sales at optimal prices for both buyer and seller. Bids are accepted, by a machine comprising computing and comparative means as well as communication, fraud detection and manipulation parameters, at three potential moments in the process, at bid placement, between bid placement and auction end and at auction end. The acceptance threshold for bids is dependent on both time, demand and market volatility, but can be any combination of 2 or more. An auction will run between auction start and auction end and will only be prematurely terminated once supplies are depleted.