In this paper we test the celebrated `Strength of weak ties' theory of Granovetter (1973). We test two hypotheses on the network structure in a data set of collaborating economists. While we find support for the hypothesis of transitivity of strong ties, we reject the hypothesis that weak ties...

We investigate the manifold posed question: To what extent does investment in human and social capital, besides the effect of talent, enhance entrepreneurial performance? We distinguish between three different performance measures: survival, profits, and generated employment. On the basis of the...