This article is the result of extensive field work fundamentally focused on the organization of small family producers through agrarian cooperatives in the Baixo Tocantins region (Pará State, Brazil). This type of socioeconomic structure in progressive expansion in the territory under study implies real improvement, not only in its social but also material and cultural aspects, both for the partners–farmers and their families and for the communities where the cooperatives are located and carry out their activities. This substantial improvement has been verified in the territory under study and is reflected in a significant increase in family income, the introduction of new practices and techniques that try to be respectful of the environment and sustainable over time, greater sovereignty in farming practices and decision-making, a noteworthy independence from traditional commercial circuits (intermediation) and the feasibility of rural life for future generations through cooperative territorialisation.

This article discusses the forms of commercialization of agro-food products based on agro-ecological families of farmers, through short circuits; based on the social construction of markets as a political act by producers and consumers. For this analysis, a bibliographic review was made addressing theoretical aspects of the social construction of the markets and experiences in the Brazilian territory referring to short marketing circuits. The results show that all these experiences, from their particularities and different strategies implemented, have done an important job in the promotion of fair trade and the solidarity economy. However, the processes of social construction of markets are highlighted, involving organized farming families and responsible consumption groups, which have demonstrated how the proximity, knowledge and trust relationships between production and consumption facilitate the marketing processes through circuits commercialization short, in relation to other channels such as the institutional market and government programs, which are made up of different bureaucratic procedures, which obviously hinder the commercialization of family farming products.