Abstract: An apparatus for brokering between buyer nodes and seller nodes in a communication system, wherein the apparatus comprises a buyer node interface configured for receiving buyer requests from respective ones of the buyer nodes, each buyer request requesting buying a respectively specified product, a seller node interface configured for receiving seller offers from respective ones of the seller nodes, each seller offer offering sale of a respectively specified group of products, a buyer group formation unit configured for forming buyer groups, each formed by combining a plurality of the buyer requests meeting at least one common similarity criterion in terms of the products specified by the buyer requests of a respective buyer group, and a broker unit adapted for, upon determining a match between the products requested by the buyer requests of a buyer group and a group of products specified by a respective one of the seller offers, brokering a sale of the respective group of products from the seller node to the