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After a long series of cumulative efforts, the historians of Economic Thought have agreed substantially on what have been the main contributions of Spanish scholasticism to economic science. They lie in the development of the theory of value and price, the integration of monetary theory in the general theory of prices, the quantitative theory of money, an interesting theory of changes, the general doctrine of interest and the analysis of the tax system. These are ideas that arose in the consideration of the great fundamental questions of just price, usury and tribute.