The early decades of the twentieth century witnessed a far-reaching growth in empirical exercises designed to measure the cost of living. Brazil was no exception to this movement, and the first studies of this nature for that country surfaced between 1935 and 1939. Among these, three deserve special attention for the soundness of their construction. These are the exercises of Horace Davis, Samuel Lowrie, and Bruno Rudolfer, professors of the Free School of Sociology and Politics of São Paulo, which investigated the cost of living in connection with the pursuit of a proper minimum wage in Brazil. The aim of this article is to revisit their pioneering efforts to measure the cost of living and to indicate how these studies touched upon the search for a minimum wage in Brazil.