Religious networks were part of the Ancient Greek economy and formed the basis of the Greek expansion in the Mediterranean. From the archaic period onwards, emporia and port cities were cosmopolitan environments in which different rituals and cults coexisted. Sanctuaries hosted cults, which often supported the activity of traders, but they were themselves economic centers under the authority of Greek cities. The property of the gods soon became the basis of economic development, including building activity, lending, and renting practices. As business units, Greek sanctuaries easily attracted large numbers of people, especially during religious festivals. They facilitated the development of commercial activities thanks to their financial capacity. The interactions of a sanctuary thus created several forms of sociability not limited to trade with the gods. Through several institutional mechanisms, as for instance asylia, many Greek cities were able to make their sanctuaries protected places where common codes of behavior applied to all participants. Myths and cults also supported the initiatives of cities to build new networks.