His most important book Economía de la sociedad colonial (The Economy of Colonial Society, 1949) was one of the first to challenge the idea of Latin American feudalism (dominant among the Communist parties of that time) and emphasize the capitalist dimension of the colonization of America.
References
^Biographical Dictionary of Twentieth-Century Philosophers. London: Routledge. 1996. pp. 42–43. ISBN0-415-06043-5.