In this paper we analyze the formation of the land market during the expansion of the frontier of the province of Buenos Aires from a local comparative perspective, studying Chascomús and Junín areas. We postulate that the constitution of the land market in the Buenos Aires province was a gradual process that began only when the the lands defended by the forts of the internal border were populated and were established certain security guarantees for private property.En este trabajo nos proponemos analizar la formación del mercado de tierras durante la expansión de la frontera de la provincia de Buenos Aires a partir de un enfoque local comparado, estudiando los partidos de Chascomús y Junín. Postulamos que la constitución del mercado de tie...