What is the difference between microeconomics and macroeconomics?

Microeconomics studies individual agents and specific markets; macroeconomics studies economy-wide aggregates. Modern macroeconomics is built largely on microeconomic foundations.

Is economics a science?

Economics uses formal models, statistical testing, and increasingly experiments, but as a social science it studies human behaviour and institutions, where controlled experimentation and prediction are harder than in the natural sciences.

Economics

Economics is the social science that studies how individuals, firms, and societies allocate scarce resources among competing ends, and how the production, distribution, and consumption of goods and services are organized through markets and institutions.

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Scope

The discipline spans microeconomics (individual agents and markets), macroeconomics (aggregates such as output, inflation, and unemployment), and a wide range of applied fields — labour, public, international, monetary, development, and behavioural economics — unified by methods of constrained optimization, equilibrium analysis, and increasingly econometrics and experiments.

Core questions

How are scarce resources allocated among competing uses?
How are prices and quantities determined in markets?
What determines the wealth, growth, and business cycles of nations?
When do markets allocate efficiently, and when and why do they fail?
How should public policy intervene in the economy?

Key concepts

Scarcity and opportunity cost
Supply and demand
Marginal analysis
Comparative advantage
Equilibrium
Aggregate demand
Market failure
Efficiency and welfare

Key theories

Classical political economy: Smith's account of the division of labour and the 'invisible hand', extended by Ricardo's theories of value, rent, and comparative advantage, established the market as a self-organizing system.
Neoclassical marginalism: Value and prices are explained by marginal utility and constrained optimization; Marshall synthesized demand and supply, and Robbins defined economics as the science of choice under scarcity.
Keynesian macroeconomics: Keynes argued that aggregate demand can leave economies in persistent under-employment equilibria, providing the rationale for active fiscal and monetary stabilization.
General equilibrium and mathematical economics: Samuelson's Foundations and the Arrow-Debreu model placed the analysis of interdependent markets on rigorous mathematical foundations, proving the existence and efficiency of competitive equilibrium.

History

Economics emerged as a distinct discipline with Smith's Wealth of Nations (1776) and classical political economy (Ricardo, Malthus, Mill). The marginal revolution of the 1870s (Jevons, Menger, Walras) and Marshall's synthesis founded neoclassical economics. The Keynesian revolution of the 1930s created modern macroeconomics, and the postwar 'formalist' turn (Samuelson, Arrow, Debreu) mathematized the field. Later decades brought monetarist and rational-expectations critiques, and the rise of econometrics, game theory, behavioural, and experimental economics.

Debates

How much should the state intervene in the economy?: Keynesian arguments for active demand management contrast with classical/monetarist and new-classical views emphasizing markets' self-correction and the limits of policy.
How realistic must economic assumptions be?: Debate continues over the rational-optimizing benchmark and 'as-if' methodology versus more behaviourally and institutionally grounded models.

Key figures

Adam Smith
David Ricardo
Alfred Marshall
Lionel Robbins
John Maynard Keynes
Paul Samuelson
Kenneth Arrow
Gérard Debreu

Seminal works

smith-1776
ricardo-1817
marshall-1890
keynes-1936
samuelson-1947
arrow-debreu-1954

Frequently asked questions

What is the difference between microeconomics and macroeconomics?: Microeconomics studies individual agents and specific markets; macroeconomics studies economy-wide aggregates. Modern macroeconomics is built largely on microeconomic foundations.
Is economics a science?: Economics uses formal models, statistical testing, and increasingly experiments, but as a social science it studies human behaviour and institutions, where controlled experimentation and prediction are harder than in the natural sciences.