Political economy is a very old subject of intellectual inquiry but a relatively young academic discipline. The analysis of political economy (in terms of the nature of state and market relations), both in practical terms and as moral philosophy, has been traced to Greek philosophers such as Plato and Aristotle as well as to the Scholastics and those who propounded a philosophy based on natural law. A critical development in the intellectual inquiry of political economy was the prominence in the 16th to the18th century of the mercantilist school, which called for a strong role for the state in economic regulation. The writings of the Scottish economist Sir James Steuart, 4th Baronet Denham, whose Inquiry into the Principles of Political Economy (1767) is considered the first systematic work in English on economics, and the policies of Jean-Baptiste Colbert (1619–83), controller general to Louis XIV of France, epitomize mercantilism in theory and in practice, respectively.
Political economy emerged as a distinct field of study in the mid-18th century, largely as a reaction to mercantilism, when the Scottish philosophers Adam Smith (1723–90) and David Hume (1711–76) and the French economist François Quesnay (1694–1774) began to approach this study in systematic rather than piecemeal terms. They took a secular approach, refusing to explain the distribution of wealth and