Pre-1936
Before the Field
No 'macroeconomics' as a discipline. Economists assumed markets self-correct. The Great Depression proved them wrong.
Macroeconomics
The study of what happens when millions of individual decisions add up to something no one decided.
Macroeconomics studies the economy as a whole — not individual firms or households, but the aggregates they produce: total output, the price level, employment, interest rates, and exchange rates. Where microeconomics asks why one worker lost a job, macroeconomics asks why five million did at the same time.
The field exists because aggregates behave differently from their parts. A single household saving more makes that household richer. Every household saving more at the same time can make everyone poorer — a result Keynes called the paradox of thrift and one that still catches policymakers off guard. Macroeconomics is the discipline that works at that level: where composition changes everything.
“Economies don't grow in straight lines. They move in waves — and understanding those waves is the whole point.”
Foundation
The Business Cycle
Economies don't grow in straight lines. They expand, slow, contract, and recover in waves. Understanding why—and what makes each wave different—is the central drama of macroeconomics.
Cycle loop
Expansion is where the pressure shifts
Spending firms, hiring broadens, and inventories rebuild.
Pick a phase below
Quarters to ~2 years
The Short Run
Demand drives the action. When spending falls sharply, output and employment drop before prices adjust. This is where recessions happen and policy responds.
~2 to 10 years
The Medium Run
Prices and wages catch up. Inflation expectations settle or shift. Policy mistakes from the short run start showing their cost.
A decade+
The Long Run
Supply sets the ceiling. Technology, institutions, and demographics determine how much the economy can produce. The question shifts from stabilization to growth.
“These waves are measured by four things. Every policy debate, every recession diagnosis, every central-bank decision traces back to them.”
What Macroeconomics Actually Tracks
Most of macroeconomics comes down to four measurable things: how much an economy produces, how many people are working, how fast prices are moving, and how much money is circulating.
Total value produced. GDP is the most common measure — useful but blind to distribution and unpaid work.
The share of people looking for work and not finding it. The headline number (U-3) misses discouraged and underemployed workers.
Inflation, deflation, and stagflation all describe changes in the price level, but each points to a different macro environment and a different policy problem.
Total money circulating, sliced into layers (M1, M2). Changes interact with rates, credit, and ultimately spending.
“Start with one surprise. Then watch output, jobs, prices, balance sheets, and policy react.”
“Who actually moves those channels? Households, firms, banks, governments, and the rest of the world.”
The Players
These are the actors whose decisions, taken together, produce the aggregates macroeconomics tracks.
Households
Consume, save, supply labor
Firms
Produce, invest, hire
Government
Tax, spend, regulate
Banks & Financial Markets
Create credit, set rates, allocate capital
Global Flows
Trade, capital movement, exchange rates
Coming Soon: Macro Simulator
Adjust the levers — spending, rates, trade — and watch the ripple effects across the economy.
“How did we figure all this out? The answer involves a Great Depression, a British economist, and a century of arguments.”
A Short History of Macroeconomics
1936–1970s
The Keynesian Revolution
Keynes argued economies can get stuck. Demand isn't guaranteed to match supply. Governments should intervene. Within a generation, this reshaped fiscal policy worldwide — and provoked decades of pushback.
1970s–2000s
Monetarism & Rational Expectations
Friedman and Lucas challenged Keynesian orthodoxy. Money supply matters. People anticipate policy. Fine-tuning the economy is harder than Keynesians thought.
2008–present
After 2008
The financial crisis broke models that assumed markets self-correct. Central banks invented new tools. Old debates about fiscal policy and stagnation reopened. The field is still processing.
“The history still matters because economists still disagree about which mechanism matters most.”
Competing Lenses on One Economy
Macroeconomists broadly agree on what to measure but disagree, sometimes sharply, on which mechanism matters most, what policy can fix, and which simplifications are worth keeping. Those disagreements are not a side note. They are the field.
The economy is one system viewed through competing lenses. Some schools share instincts, some reject each other outright, and many split most sharply when policy has to move before the evidence is settled.
Shared instinct
Direct disagreement
Belief: Weak aggregate demand can leave the economy stuck below full employment.
Pushes back on: Pushes back on the idea that markets reliably self-correct when private demand collapses.
Direct disagreement
Demand shortfalls vs. nominal discipline.
Direct disagreement
Weak self-correction vs. fast adjustment.
Shared instinct
Demand weakness and policy still matter.
Shared instinct
Markets can remain unstable without active support.
Selected tradition
Keynesian
Demand shortfalls cause recessions; fiscal and monetary policy should actively stabilize the economy.
Belief
Weak aggregate demand can leave the economy stuck below full employment.
Main disagreement
Pushes back on the idea that markets reliably self-correct when private demand collapses.
Current map links
Keynesian sits in the map through these nearest agreements and disputes.
Direct disagreement: MonetaristDirect disagreement: New ClassicalShared instinct: New KeynesianShared instinct: Heterodox
Policy routes
“Every school thinks it has the answer. But do you? Start with your own question.”
Have a unique question? Let the data give you some answers.
Bring the question you already have. Pick the pressure point, then open the tool that gets you moving.
Indicators
Browse over a thousand U.S. macroeconomic series from official sources. Add any to a custom dashboard.
Browse indicatorsDashboards
Build combinations. Compare, overlay, annotate, and revisit whenever the data updates.
Open dashboardModel routes
Data-Driven Models
Statistical models fit to historical data. Find patterns and generate forecasts without imposing theoretical structure.
DSGE
Structural models built from micro foundations. Used by central banks worldwide to simulate policy scenarios.
Agent-Based Models
Thousands of agents follow simple rules. Aggregate behavior emerges bottom-up — herding, contagion, crashes.
“All models are wrong, but some are useful.”
No model is the economy. Every simplification leaves something out. When a model confirms what you already believed, that is exactly when to look hardest at what it assumed. Save your indicators to a dashboard, track them over time, and let the data challenge your priors — not just confirm them.