According to the knowledge spillover theory of entrepreneurship, knowledge created endogenously results in knowledge spillovers, which allow independent entrepreneurs to identify and exploit opportunities (Acs et al. in Small Bus Econ 32(1):15–30, <CitationRef CitationID="CR3">2009</CitationRef>). The knowledge spillover theory of...</citationref>

This paper describes the evolution of networks during the first three years after start-up and puts forward explanations of the nature of networks of young firms after three years. We extend current research on networks by explicitly including both temporal change and spatial variation in our...