The role of first principles in economics is examined through the lens of dominant methodological approaches of the classical and neoclassical periods. First principles are most clearly displayed in pure deductive systems. The tension between first principles as the basis for deductivist...

Standard histories of economics usually treat the "marginal revolution" of the midnineteenth century as both supplanting the "classical" economics of Smith and Ricardo and as advancing the idea of economics as a mathematical science. The marginalists - especially Jevons and Walras - viewed...