School of Salamanca
Tomás de Mercado (1525–1575) was a Spanish Dominican friar and both an economist and a theologian, best known for his book "Summa de Tratos y Contratos" ("Manual of Deals and Contracts") of 1571. Together with Martín de Azpilcueta he founded the economic tradition of "Iberian monetarism"; both form part of the general intellectual tradition often known as "Late Scholasticism", or the School of Salamanca.