The optimal ordering strategy under the GBA in more than three retailers

GBA(Group-Buying Auction) is coming to be an important part of online auction. Most of the previous studies about retailers' ordering strategy were in two retailers, and the current conclusion is that the retailers will buy more products in the GBA mechanism than in the fixed-price mechanism in the case of two retailers. As long as the threshold is not too high, the profit and the service level of the retailers can be improved. This paper studies the optimal ordering strategy based on GBA in more than three retailers, and the previous conclusion still tenable in this case.