The Italian debate on industrial districts suggests that local development can be based on small and medium-sized firms provided they work in teams and are embedded in a local system of social relations. If the availability of local public goods complements the private supply of local specialized services and goods, Marshallian external economies are engendered. When inner social and economic relations boost the supply of local public goods, and are reproduced by the consistent economic behaviour of local (economic and political) agents, they become local factors of economic development or in other words, the district's social capital. These propositions are considered within a three-layered framework comprising structure, conduct and performance. The relations among these levels allow joint consideration of three different processes of economic selection: competitive, strategic, evolutionary. This complexity is necessary if the conditions that foster significant Marshallian external economics are to be represented correctly.
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