economic.wiki

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MACROECONOMICS · FOUNDATIONAL

Gross Domestic Product

The total monetary value of all finished goods and services produced within a country's borders in a specific time period. GDP serves as a comprehensive scorecard of a nation's economic health, though its limitations as a measure of well-being have been debated since its inception.

0 US GDP 2024

0 First Measured

0 Growth Rate

Simon Kuznets developed the concept in a 1934 report to the US Congress, though he cautioned against using it as a measure of welfare. The metric counts market transactions but ignores household labor, environmental degradation, and income distribution. Robert F. Kennedy famously noted that GDP "measures everything except that which makes life worthwhile."

Despite its flaws, GDP remains the primary metric for comparing economic output across nations. Alternatives like the Genuine Progress Indicator (GPI) and the Human Development Index (HDI) attempt to capture what GDP misses, but none have achieved its universal adoption.

GDP = C + I + G + (X - M)

Kuznets, S. (1934). National Income, 1929-1932. Senate Document No. 124.

Coyle, D. (2014). GDP: A Brief but Affectionate History. Princeton University Press.

MICROECONOMICS · CORE THEORY

Supply and Demand

The fundamental model of price determination in a market. The intersection of supply and demand curves establishes equilibrium price — the invisible hand's most visible mechanism. Alfred Marshall's scissors metaphor endures: neither blade alone cuts.

0 Marshall's Principles

Marshall's Principles of Economics (1890) formalized the supply-demand framework that remains the cornerstone of microeconomic analysis. The model elegantly captures how decentralized decisions by millions of buyers and sellers coordinate through price signals.

Modern extensions include elasticity analysis, surplus calculations, and dynamic adjustments. The model's simplicity is both its greatest strength and weakness — real markets feature information asymmetries, externalities, and behavioral biases that the basic framework cannot capture.

MONETARY · POLICY

Inflation

The rate at which the general level of prices for goods and services rises, eroding purchasing power. Milton Friedman declared it "always and everywhere a monetary phenomenon," though modern economists recognize cost-push, demand-pull, and expectation-driven channels.

0 Target Rate

0 US Peak (1980)

Central banks worldwide target low, stable inflation — typically around 2% — as the sweet spot between deflationary stagnation and inflationary erosion. The Phillips Curve initially suggested a stable trade-off between inflation and unemployment, but the stagflation of the 1970s shattered that simplicity.

Real Rate = Nominal Rate - Inflation Rate

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BEHAVIORAL · COGNITIVE

Loss Aversion

Kahneman and Tversky's discovery that losses loom larger than gains — roughly twice as powerful psychologically. A $100 loss hurts more than a $100 gain pleases, fundamentally challenging rational agent models.

0 Prospect Theory

0 Loss Multiplier

Prospect Theory, published in Econometrica in 1979, demonstrated that people evaluate outcomes relative to a reference point rather than in absolute terms. The value function is concave for gains and convex for losses, with a steeper slope for losses.

This insight has transformed fields from insurance to marketing to public policy. The endowment effect, status quo bias, and sunk cost fallacy all stem from loss aversion's fundamental asymmetry.

HISTORY · CRISIS

The Great Depression

The most severe economic downturn in modern history, lasting from 1929 to 1939. Stock market crash, bank failures, and catastrophic policy errors combined to devastate the global economy and reshape the role of government in economic life forever.

0 Black Tuesday

0 Peak Unemployment

0 GDP Decline

The crash of October 1929 was not the cause but the trigger. A decade of speculative excess, agricultural overproduction, and structural weaknesses in the banking system created fragility. The Federal Reserve's tight monetary policy and the Smoot-Hawley Tariff deepened what might have been an ordinary recession.

The Depression birthed Keynesian economics, the New Deal, the FDIC, Social Security, and the modern welfare state. It demonstrated that markets do not always self-correct — at least not on timescales acceptable to democratic societies.

Friedman, M. & Schwartz, A. (1963). A Monetary History of the United States. Princeton University Press.

Bernanke, B. (2000). Essays on the Great Depression. Princeton University Press.

TRADE · THEORY

Comparative Advantage

David Ricardo's elegant proof that trade benefits both parties even when one is absolutely better at producing everything. Nations should specialize in goods where their opportunity cost is lowest — the bedrock of free trade arguments since 1817.

0 Ricardo's Principles

Paul Samuelson called comparative advantage "the best example of a true and non-trivial principle in the social sciences." Ricardo's wine-and-cloth example between England and Portugal demonstrated that total output increases when each nation specializes according to opportunity cost.

Modern trade theory extends this through the Heckscher-Ohlin model (factor endowments), New Trade Theory (economies of scale), and gravity models. Yet the basic insight endures: voluntary exchange creates value, even between unequal partners.

MACROECONOMICS · THEORY

Keynesian Economics

John Maynard Keynes argued that aggregate demand drives economic output and employment, especially in the short run. When private spending falls, government must step in — the intellectual foundation of fiscal stimulus and counter-cyclical policy.

0 General Theory

The General Theory of Employment, Interest and Money (1936) revolutionized economics by challenging the classical assumption that markets always clear. Keynes showed that economies could settle into equilibrium with persistent unemployment — a "liquidity trap" where monetary policy alone cannot stimulate growth.

Y = C(Y-T) + I(r) + G + NX

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LABOR · MARKETS

Minimum Wage Debate

Does a price floor on labor reduce employment or lift workers from poverty? The empirical battle between Card-Krueger's natural experiments and classical supply-demand predictions remains one of economics' most contested questions.

0 US Federal Min.

0 Card-Krueger Study

Card and Krueger's 1994 study of fast-food restaurants along the New Jersey-Pennsylvania border found no significant employment decrease from a minimum wage increase, challenging decades of textbook predictions. The debate continues with Neumark-Wascher studies finding negative effects and Dube-Lester-Reich finding minimal impact.

BEHAVIORAL · DECISION THEORY

Nudge Theory

Thaler and Sunstein's framework for designing choice architectures that guide decisions without restricting freedom. Default options, framing effects, and social norms become policy tools — libertarian paternalism in action.

0 Published

Opt-out organ donation, automatic 401(k) enrollment, and cafeteria food placement are canonical nudges. The UK's Behavioural Insights Team ("Nudge Unit") demonstrated that small changes in default options can dramatically improve tax compliance, pension saving, and health outcomes.

MONETARY · INSTITUTIONS

Central Banking

The institution that controls the money supply, sets interest rates, and acts as lender of last resort. From the Bank of England (1694) to the Federal Reserve (1913) to the ECB, central banks shape the tides of economic life through monetary policy.

0 Bank of England

0 Federal Reserve

Modern central banking evolved from the gold standard era through Bretton Woods to today's inflation-targeting regimes. The 2008 financial crisis expanded central bank toolkits to include quantitative easing, forward guidance, and negative interest rates — tools Bagehot never imagined.

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MICROECONOMICS · STRUCTURE

Game Theory

The mathematical study of strategic interaction between rational agents. From Nash equilibrium to mechanism design, game theory provides the formal language for analyzing competition, cooperation, auctions, voting, and conflict.

0 von Neumann & Morgenstern

0 Nash Equilibrium

0 Nobel Prizes

Von Neumann and Morgenstern's Theory of Games and Economic Behavior (1944) launched the field. Nash's 1950 proof that every finite game has at least one equilibrium in mixed strategies provided its cornerstone theorem. Since then, game theory has expanded into evolutionary biology, computer science, and political science.

The Prisoner's Dilemma remains its most famous illustration: two rational actors choosing individual optimization arrive at a collectively suboptimal outcome — a parable for arms races, environmental degradation, and price wars.

von Neumann, J. & Morgenstern, O. (1944). Theory of Games and Economic Behavior. Princeton University Press.

TRADE · DEVELOPMENT

Globalization

The increasing interconnection of the world's economies through trade, capital flows, migration, and technology transfer. Proponents see poverty reduction and efficiency gains; critics see inequality, cultural erosion, and race-to-the-bottom dynamics.

0 World Trade (2024)

The current wave of globalization accelerated after 1990 with the fall of communism, the rise of container shipping, and digital communication. China's WTO accession in 2001 was its watershed moment. The "elephant chart" by Branko Milanovic captures its distributional impact: massive gains for Asian middle classes and the global top 1%, stagnation for Western working classes.