From the Invisible Hand to the General Theory: A Timeline
1759–1776: Smith Builds the Case for Markets
Adam Smith published The Theory of Moral Sentiments in 1759, seventeen years before the book he is remembered for. It matters because it is where the invisible-hand image first appears, in a passage about landlords whose consumption unintentionally supports those who work for them. The Wealth of Nations followed in 1776, the same year as the American Declaration of Independence. Its argument is that national prosperity comes from productivity, that productivity comes from the division of labour, and that self-interested exchange in competitive markets tends to coordinate production without anyone directing it. Smith was writing against mercantilism — the doctrine that a nation grows rich by hoarding bullion and restricting imports — and much of the book is a sustained attack on trade barriers and chartered monopolies. He was not writing against government as such; he assigned it defence, justice, and certain public works and institutions.
1798–1848: The Classical School Consolidates
After Smith, a recognisable classical school took shape. Thomas Malthus's population essay (1798) and David Ricardo's Principles (1817) added the theories of population pressure, differential rent and comparative advantage. Jean-Baptiste Say popularised the proposition — later compressed into the slogan that supply creates its own demand — that a general glut of all goods at once is impossible, since producing goods generates the income to buy them. This became known as Say's law and is precisely the proposition Keynes would later attack by name. John Stuart Mill's Principles of Political Economy (1848) gathered the classical system into an authoritative textbook. Running through all of it was the assumption that a market economy, left to adjust, tends toward full employment of its resources, with gluts and slumps treated as temporary and self-correcting.
1871–1890: The Marginal Revolution and Marshall
Between 1871 and 1874, Jevons, Menger and Walras independently relocated the source of value from labour to marginal utility, and Alfred Marshall's Principles of Economics (1890) fused the new marginalism with the older classical concern for cost of production. Marshall gave the discipline the supply-and-demand cross, elasticity, and consumer surplus, and he trained a generation at Cambridge — including the young John Maynard Keynes, whose father was also an economist and a colleague of Marshall's. This is the tradition Keynes came out of and, in one specific respect, turned against. The marginalist framework was superb at analysing a single market in isolation but assumed that the economy as a whole cleared, so it had little to say when every market seemed to be failing to clear at once.
1919–1929: Keynes Emerges as a Public Economist
Keynes made his name not with theory but with polemic. The Economic Consequences of the Peace (1919), written after he resigned from the British delegation at Versailles, argued that the reparations demanded of Germany were economically self-defeating. His A Tract on Monetary Reform (1923) contains his single most quoted sentence — that in the long run we are all dead — which is a complaint about economists who reassure the public that markets will right themselves eventually while a slump is happening now. The line is very frequently miscredited to the General Theory; it belongs to the 1923 Tract. Through the 1920s Keynes argued for active demand management and public works against a Treasury orthodoxy that held such spending merely displaced private activity.
1936: The General Theory Breaks the Consensus
The General Theory of Employment, Interest and Money appeared in 1936, in the seventh year of the Great Depression. Its central claim is that an economy can come to rest at an equilibrium with large-scale involuntary unemployment, and stay there, because there is no automatic force that restores full employment quickly enough to matter. The level of output is set by aggregate demand; the multiplier magnifies changes in spending; the interest rate is governed by liquidity preference rather than by saving and investment alone; and private investment swings with animal spirits, a spontaneous urge to act rather than a calculation over knowable probabilities. The policy implication — that government can and sometimes should raise demand directly — reversed the classical presumption and defined macroeconomic argument for the rest of the century.