Abstract: A computer-implemented method for satisfying a purchase requisition includes receiving, from each of a plurality of candidate suppliers, a corresponding plurality of bids. At least one candidate supplier includes, with its bids, an offer of a business-volume discount that is triggered when an aggregate purchase of at least one unit of a first item and at least one unit of a second item is within a defined volume interval. An optimal award schedule for satisfaction of the purchase requisition is then determined.

Abstract: A computer-implemented method for determining an optimal award schedule for at least partial satisfaction of a requisition includes receiving from a buyer over a computer network, public buyer constraints representative of the requisition. These public buyer constraints are made available to prospective suppliers over the computer network. Candidate suppliers from the set of prospective suppliers then submit bids for analysis by the buyer. This is followed by the determination of an optimal award schedule for at least partial satisfaction of the buyer's requisition.