The social capital is the set of social networks and the reciprocity norms associated to them that create value, as physical capital and human capital do (Putman and Goss, 2003). More concretely, Coleman (1990) defines social capital as the set of structural resources inherent to social organisation, such us trust, norms and networks that improve efficiency in society, because they facilitate the coordinate action.

Granovetter (1995) says that economic development is produced by a mechanism that (i) allows people to make use of the benefits of being a more reduced community member, but (ii) qualify them to acquire skills and resources to participate in networks that surpass their own communities, joining the economic majority. These kinds of community resources have been seen as necessary condition for business success and survival. There is some evidence for the existence of a link between social capital and the probability of become an entrepreneur.

The aim of this paper is to contribute to the analysis of the relationship between social capital and entrepreneurship and business development, in a multidisciplinary approach combining economics, political science, psychology and sociology. Firstly, we will present a review of the concepts of social capital and social networks as applied to entrepreneurship. After that, we will study the factors that create or destroy social capital. Thirdly, we will analyse motivation of entrepreneurial activity and two models of Emotional Energy promoting entrepreneurship will be presented. Lastly, some empiricical evidence of the relationship between some social capital indicators and entrepreneurial measures will be presented.