The invention relates to both a method and a computer system that are designed to provide a bid positioning system using a computerized bid proxy. The bid proxy takes instructions from the bidder and then bids based upon these instructions. Using a bid positioning system allows this bidder to place its bids in relation to a lead bid placed by another bidder in an auction based upon either a nominal or percentage distance from the lead bid. In a preferred embodiment, this computerized bid proxy is used in a shipment management system. This system allows a shipper to present at least one shipping requirement for a particular shipment to a centralized server. These shipping requirements could include the origin and destination of a shipment, the time or delivery date of a shipment, the number of articles being shipped, and the weight or volume of the shipment. The server next sends the at least one shipping requirement to a plurality of carriers some of whom are chosen by the shipper and some of whom are chosen by the system. These carriers next bid based upon the at least one shipping requirement. This system and method also allows these carriers to re-quote their bids based upon the bids presented by the other carriers. Once all of the bid deadline has been reached, the shipper picks the quote that best suits the shipper.