Abstract: A system and method of procuring an advertising inventory over a communications network may include establishing a set of nodes defined by desired component attributes of inventory for an advertiser for an ad campaign. The established set of nodes may be stored. Valuation of nodes having unknown price and volume parameters may be estimated. The set of nodes may be explored to determine estimated price and volume parameters for the nodes. The set of nodes may be exploited for the ad campaign, where the exploitation may be inclusive of at least one extrapolated node having an estimated valuation. Results of the exploited set of nodes for the ad campaign may be generated.