An increasingly common implementation of electronic commerce over the World Wide Web is based on the virtual mall or community concept (Gaffin, 1995). Such virtual communities operate as a assortment of individual electronic storefronts that offer a variety of goods and services to the on-line shopper. (Hoffman, Novak and Chatterjee, 1996). The most visible electronic commerce transactions are the ones between the electronic tenants and their potential customers. A less obvious type of electronic commerce relationships but also as important, is the one linking individual tenants of electronic communities. In this paper we propose a taxonomy of such symbiotic relationships and present an agenda for further research