Abstract: Described herein is an improved system and method for buying and selling portions of a composite good in an electronic marketplace. One method and system comprise communicating to a buyer a first good post associated with a seller, and communicating to a seller a “want to buy” post from the buyer, wherein the “want to buy” post is for a second good different from, but associated with, the first good. Another system and method comprise displaying online a want to buy post from a buyer, for a first good, and communicating to a buyer a seller offer for a second good, associated with the first good.