A minor masterpiece? Reconsidering <i>De ponderibus et mensuris</i> by Juan de Mariana

Abstract The article investigates a little‐known work titled De ponderibus et mensuris [On Weights and Measures] written by Juan de Mariana in 1599. It contains the embryo of his future monetary theories, and has other interesting aspects, not only juridical and historical but also epistemological. Significant points of convergence with the early modern mathematics and abacus tradition make it unique. Apart from its stylistic, pedagogical and technical originality, this work also appears as a watershed for the evolution of economic science, its language and methodology.