The General Theory of Employment, Interest and Money
Book that shifted economic thought toward macroeconomics and government intervention.
John Maynard Keynes’s 1936 book reshaped economics by placing macroeconomics at the center of the field and introducing much of its modern vocabulary—an upheaval known as the Keynesian Revolution. In policy, it was widely read as a justification for government spending, budget deficits, monetary intervention, and counter-cyclical measures. The work is marked by a deep skepticism toward the rationality of free markets. Keynes rejected the idea that an economy naturally adjusts to full employment, even when in equilibrium, arguing instead that markets’ volatile and unpredictable psychology causes recurring booms and crises. The book is a direct attack on the classical economics of its time, introducing concepts like the consumption function, the principle of effective demand, and liquidity preference, while elevating the multiplier and the marginal efficiency of capital.
Keynes’s central claim is that employment levels depend not on the price of labor (as classical theory held) but on aggregate demand. If total demand for goods at full employment falls short of total output, the economy must shrink until the two are equal. He thus denied that full employment is the natural outcome of competitive markets in equilibrium. In a 1935 letter to George Bernard Shaw, Keynes predicted his book would revolutionize economic thinking within a decade. The first chapter, just half a page, declares the title’s emphasis on “general” to contrast his arguments with the classical theory he was taught, which he argues applies only to a special case—a limiting point of possible equilibria—not to the real economic world, making its teachings “misleading and disastrous.”
The core theory appears in Chapters 2–15, 18, and 22. Book I repudiates Say’s law, which Keynes attributes to classical economists: the idea that wages equal the value of goods produced and are always spent back into the economy, so supply creates its own demand and a glut of output cannot cause job losses. Say’s law relies on a functioning market economy; if unemployment exists without distortions, workers would accept lower wages, pushing wages down and increasing jobs. Classical economists saw such distortions as the cause of unemployment and argued for their removal. Keynes, however, viewed these distortions as inherent to the economy and advocated different policies, which also had social consequences he personally favored. Distortions preventing wage cuts include monetary employment contracts, minimum wage laws, state benefits, workers’ unwillingness to accept income reductions, and union resistance to market pressures. Keynes accepted the classical link between wages and labor’s marginal productivity—his “first postulate”—expressed as y’(N) = W/p, where output y depends on employment N, and W/p is the real wage.
- field
- Economics
- nationality
- English
- known_for
- Keynesian Revolution, The General Theory of Employment, Interest and Money
Lore & Background
The General Theory is a sustained attack on the classical economics orthodoxy of its time. Keynes denied that an economy would automatically adapt to provide full employment even in equilibrium, and believed that the volatile and ungovernable psychology of markets would lead to periodic booms and crises. The central argument is that the level of employment is determined not by the price of labour, as in classical economics, but by the level of aggregate demand. If the total demand for goods at full employment is less than the total output, then the economy has to contract until equality is achieved. Keynes's theory is based on the interaction between demands for saving, investment, and liquidity. Saving and investment are necessarily equal, but different factors influence decisions concerning them. The desire to save is mostly a function of income: the wealthier people are, the more wealth they will seek to put aside. The profitability of investment is determined by the relation between the return available to capital and the interest rate. The economy needs to find its way to an equilibrium in which no more money is being saved than will be invested, and this can be accomplished by contraction of income and a consequent reduction in the level of employment. Keynes accepted the classical relation between wages and the marginal productivity of labour, but proposed a 'second postulate of classical economics' asserting that the wage is equal to the marginal disutility of labour. He argued that the postulates of the classical theory are applicable to a special case only and not to the general case, and that its teaching is misleading and disastrous if applied to the facts of experience.
Reader's Guide
Its significance lies in challenging the classical economic orthodoxy that full employment is the natural result of competitive markets in equilibrium. Keynes argued that the level of employment is determined by aggregate demand, not by the price of labour, and that market psychology leads to periodic booms and crises. The book introduced key concepts such as the consumption function, the principle of effective demand, liquidity preference, and gave new prominence to the multiplier and the marginal efficiency of capital. Its policy implications were interpreted as providing theoretical support for government spending, budgetary deficits, monetary intervention, and counter-cyclical policies. The work is pervaded with an air of mistrust for the rationality of free-market decision-making. The first chapter, only half a page long, emphasizes the prefix 'general' to contrast with classical theory, which Keynes argued applies only to a special case. The book's legacy includes the 'Keynesian Revolution' in economic thought and policy.
Did You Know?
- The first chapter of The General Theory is only half a page long.
- The book introduced the concepts of the consumption function, the principle of effective demand, and liquidity preference.
- Keynes denied that full employment was the natural result of competitive markets in equilibrium.
Frequently Asked Questions
What field does The General Theory of Employment, Interest and Money belong to?
It sits squarely in the field of economics, specifically reshaping how people think about macroeconomics. The book helped establish macroeconomic analysis as a central pillar of economic theory.
What is the 'Keynesian Revolution' associated with this book?
The term describes the sweeping shift in economic thinking that the book triggered, moving the discipline away from classical assumptions toward a framework centered on aggregate demand. It also introduced much of the vocabulary that economists still use in their everyday work.
How did The General Theory of Employment, Interest and Money influence government policy?
Policymakers read the book as intellectual justification for active fiscal and monetary intervention, including running budget deficits and implementing counter-cyclical measures. It gave governments a theoretical basis for spending during downturns rather than simply balancing budgets.
Why is The General Theory of Employment, Interest and Money still important today?
It fundamentally restructured how economists understand unemployment, interest rates, and the role of government in stabilizing the economy. Nearly a century after publication, its core ideas continue to shape both academic debate and real-world policy decisions.
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