This paper investigates the relationship between human capital in micro and small enterprises and their respective behaviors in innovation and internationalization. Based on a case study of interpretative nature, from 2010 till 2012 we collected data about the agri‑food complex of Tagus Valley (Portugal) through triangulation of techniques typically used in qualitative research: direct observation (in farms, units of processing, storage and packaging food stuffs and wines, and regulatory and promotional agents); semi‑structured interviews with individuals representing the various categories of agents involved, alongside a survey with 110 business agents; and statistical data gathered in the Portuguese Agriculture Census. Survey data were object of descriptive, correlational and regression analyses. Our research provides evidence of firms making use of stable partnerships with intermediary economic agents and promoting organizations and demonstrating how effective are endogenous assets (especially those of non‑mercantile nature) to the competitiveness of a rural territory, in the framework of Common Agricultural Policy. In terms of public policies for competitiveness and innovation, according to an institutional view, the state and regional/local governments, research institutions (public or private), higher education institutions and business training centers, sharing a common agenda for endogenous assets valuation, might play a strategic role in an economy strongly built on micro and small enterprises, whose sustainability depends on collaborative networking.