Networks are crucial to both large and small enterprises in Ghana. They provide access to information about new technologies and markets, they facilitate co-operative ventures, and thirdly help enforce informal trade, credit, and insurance contracts and arrangements. But what are the effects on business productivity of networks designed to perform these different functions? Which types of enterprise build which types of networks? And which type of network should small-scale entrepreneurs be encouraged to build to improve their competitiveness in a globalising market? Research from the UK Centre for the Study of African Economies (CSAE) addresses these questions whilst considering the effects of networking on large and small enterprises in Ghana.