Abstract: A method enables a seller to bid in multiple electronic reverse auctions. The method includes determining auctions for which the seller is eligible, informing the seller of the eligible auctions, and receiving a selection indicating which of the eligible auctions the seller will participate in. The method also includes receiving a single bid from the seller, and applying the single bid to each of the selected auctions. Based upon the single bid, as well as bids from other sellers, winnings are determined for each of the selected auctions.

Abstract: A method of facilitating placement of an advertisement. A specification, which includes at least a budget and a reserve cost and designates creative material for the advertisement, is received from an advertiser. A deposit of funds, in an amount that is at least equal to the budget, and the creative material, are also received from the advertiser. The specification is publicized to media carriers. One or more bids from one or more of the media carriers are received. Each received bid is compared with the specification. Those media carriers submitting bids which are below the reserve costs are identified. The creative material is then transferred to each of the identified media carriers for placement.