methods and systems for managing the sale of commodities , such as tier - priced commodities , are described . risk is managed by bundling with the commodity a financial instrument designed to indemnify against the risks associated with purchasing the commodity . the financial instrument may be an insurance instrument , for example . in one embodiment , bundled products are offered for sale to two or more bidders , at respective offer prices . the bidder that exceeds their respective offer price by the greatest amount is sold the bundled product . different prices may be offered to different purchasers for respective bundled products . the offers , bids , and determination of who wins the bidding may be made by processors or computers coupled to networks , such as the internet .