Disclosed is a method and system for effectuating a buyer-driven and buyer-executed commerce system. The system allows prospective buyers and sellers of goods and services to anonymously exchange conditional Requests For Bids and Conditional Sales Offers based on the buyer's guaranteed `purchasing loyalty` for a self-defined minimum quantity of goods or services, and/or quality of goods or services and/or the length of time or price to which the buyer would agree to be bound or any combination of those conditions. That buyer guarantee permits a seller to easily pre-determine their offers based on the calculated value of `capturing` that buyer's `guaranteed purchasing loyalty`.