International audienceThe Venezuelan system of potatoes and potato seeds production endures many deficiencies, while potatoes use to be a basic component of inhabitants' food. To uncover the deep roots of these deficiencies, we propose a simulation model of this system and combine structural properties of the model with simulation results in order to consolidate the validity of the model, elucidate some of its key features and suggest a way likely to improve its fairness. The model is designed using the SocLab framework, a formalisation of Systems of Organized Action that considers how regulation emerges from balances between the power relationships processes of social actors