Second,the tools support the combinatorial reality of how cost (and thus bid price) must vary as a function of different combinations of routes. Logistics.com supports conditional bidding, which lets carriers bid one price for a single route and a different price if that route is combined with another route. Thus, carriers can submit multiple overlapping bids with different combinations (thus bidding for efficient route combinations that have round-trips, have closed tours, or mesh well with that carrier' s other routes) As a result, the auction might receive tens of millions of bids. Logistics.com's tools automate the evaluation of large number of bid packages to find a combination of bids that covers all the routes,minimizes total cost,satisfies other constraints, and optimizes other attributes