What are the sources of competitive advantages of vendors in an economy of purely rational and anonymous agents? Hereafter, throughout to the case study of Darknet markets, we attempt to develop a new model of competitive advantage that brings together knowledge of strategic management and economic complexity theories. Over the last five years, researches in the field of Darknet marketplaces have been started and a partial light has been shed over the mystery of the illegal e-commerce. Ultimately, as a first approximation, a Darknet market can be defined as a virtual tripartite network of anonymous vendors, products and customers. In this context, the Darknet market constitutes a good approximation of an economy of purely rational and anonymous agents, with limited contacts and relationships, based only on economic exchange.