The economic literature has showed that cooperation between workers, and therefore good interpersonal relationships inside firms, promote the reduction of transaction costs, allowing the accumulation of social capital.

Social capital is, as noted, a form of capital, such as physical and human, as:

–      informal norms can support collective action and cooperation within organizations;

–      in recent years, the knowledge management literature has revealed the big relevance of relations, networks and values existing within organizations.

The aim of paper is to identify what kind of production organization promotes the accumulation of social capital. The democratic firm model seems, in principle, be a good answer to our research, in relation to its structure of remuneration of labour factor and its attitude to promote a pleasant and cooperative business climate.

In this context, starting by the literature strand of evolutionary theory, we will demonstrate – with the help of a simple theoretical model – as democratic firm is the best type of enterprise to transform cooperatives choices of workers into structural characteristics of the organization, via the emergence of organizational routines. In this way, the enterprise can reduce transaction costs and can favour the accumulation of social capital.