A method on a server for managing discount offers for a plurality of users over a communications network. The method includes receiving a discount offer, wherein a discount offer comprises at least a product or service description, an initial price, a discount price less than the initial price, a minimum number of acceptances and a time deadline, and transmitting the discount offer to the plurality of users. The method further includes receiving acceptances of the discount offer, and detecting attainment of a predefined time before the time deadline. The method further includes decreasing the minimum number of acceptances by a numerical decrement, if the number of acceptances is less than the minimum number of acceptances at the predefined time before the time deadline, and re-transmitting the discount offer with a decreased minimum number of acceptances to the mobile computers of the plurality of users.