Economics
Understanding how the economy works and how it affects your life.
Chapters
About this tutorial
Understanding how the economy works and how it affects your life.
Why Learn Economics
- Make better financial decisions
- Understand policy debates and vote informed
- See through economic misinformation
- Understand business and markets
- Predict consequences of policies
- Navigate career and investment decisions
Contents
| Chapter | Topic |
|---|---|
| 01-fundamentals | Supply, demand, and market basics |
| 02-macroeconomics | GDP, inflation, unemployment |
| 03-microeconomics | Individual and business decisions |
| 04-money-banking | How money and banking work |
| 05-fiscal-policy | Government spending and taxes |
| 06-monetary-policy | Central banks and interest rates |
| 07-international | Trade, globalization, currencies |
| 08-labor-markets | Employment, wages, job markets |
| 09-behavioral | Psychology meets economics |
| 10-practical | Applying economics to life |
Core Concepts
Supply and Demand
The foundation of all economics:
| Concept | Meaning |
|---|---|
| Supply | How much producers will sell at each price |
| Demand | How much consumers will buy at each price |
| Equilibrium | Where supply meets demand |
| Shortage | Demand exceeds supply (price too low) |
| Surplus | Supply exceeds demand (price too high) |
Price signals: Prices communicate information. High prices say "make more" or "use less." Low prices say "make less" or "use more."
Opportunity Cost
Every choice has a cost: what you give up.
- Spending $50 = not having that $50 for something else
- Time spent on X = time not spent on Y
- Choosing career A = not having career B
Always ask: What am I giving up?
Incentives Matter
People respond to incentives:
| Type | Example |
|---|---|
| Financial | Higher pay → more work |
| Social | Status → certain behaviors |
| Moral | Right thing → intrinsic motivation |
| Negative | Penalties → avoiding behavior |
Key insight: Predict behavior by looking at incentives, not intentions.
Trade-offs
There's no free lunch:
| Trade-off | Explanation |
|---|---|
| Efficiency vs. Equality | More redistribution may reduce growth |
| Inflation vs. Unemployment | Short-term trade-off (Phillips curve) |
| Present vs. Future | Consume now or save for later |
| Risk vs. Return | Higher returns require higher risk |
Key Economic Indicators
What to Watch
| Indicator | Meaning | Healthy Range |
|---|---|---|
| GDP Growth | Economy expanding or contracting | 2-3% annually |
| Inflation (CPI) | Prices rising | 2% target |
| Unemployment | People seeking work | 4-5% "natural rate" |
| Interest Rates | Cost of borrowing | Varies by conditions |
| Debt/GDP Ratio | Government debt burden | Below 100% preferable |
Economic Cycles
| Phase | Characteristics | Typical Duration |
|---|---|---|
| Expansion | Growth, low unemployment, rising prices | 3-10 years |
| Peak | Maximum activity, inflation concerns | Months |
| Recession | Declining output, rising unemployment | 6-18 months |
| Trough | Bottom of cycle, before recovery | Months |
Recessions are normal. They've occurred roughly every 5-10 years throughout history.
Money and Banking
How Money Works
| Concept | Explanation |
|---|---|
| Fiat money | Value from government decree, not backing |
| Money supply | Total money in circulation |
| Fractional reserve | Banks lend most of deposits |
| Money creation | Loans create new money |
Federal Reserve Tools
| Tool | How It Works | Effect |
|---|---|---|
| Interest rates | Fed sets target rate | Lower = more borrowing, spending |
| Open market ops | Buy/sell bonds | Inject/remove money from system |
| Reserve requirements | Banks must hold % of deposits | Higher = less lending |
| Forward guidance | Communicate intentions | Shape expectations |
Economic Systems
| System | Key Features | Examples |
|---|---|---|
| Capitalism | Private ownership, markets, profit motive | US, UK |
| Socialism | Public ownership, state planning | Cuba (partial) |
| Mixed economy | Private + government intervention | Most developed nations |
| Command economy | Central planning | Soviet Union (historical) |
Reality: Most economies are mixed. The question is where on the spectrum.
International Economics
Trade
Why trade: Specialization increases total output (comparative advantage).
| Concept | Meaning |
|---|---|
| Comparative advantage | Produce what you're relatively best at |
| Tariffs | Taxes on imports |
| Trade deficit | Imports > exports |
| Trade surplus | Exports > imports |
Trade creates winners and losers within each country, even if net benefit is positive.
Exchange Rates
| Stronger dollar | Weaker dollar |
|---|---|
| Imports cheaper | Exports cheaper |
| Exports harder to sell | Imports more expensive |
| Travel abroad cheaper | Foreign tourists attracted |
Common Economic Fallacies
| Fallacy | Reality |
|---|---|
| "Tariffs protect jobs" | They protect some jobs, destroy others |
| "Trade deficits are bad" | They reflect capital inflows |
| "Inflation helps debtors" | Only unexpected inflation; harms savers |
| "Minimum wage is free money" | Creates trade-offs in employment |
| "GDP = wellbeing" | GDP measures output, not quality of life |
| "Zero-sum thinking" | Trade/growth can be positive-sum |
Economics in Daily Life
Personal Decisions
| Decision | Economic Thinking |
|---|---|
| Career choice | Compare lifetime earnings, opportunity cost |
| Buy vs. rent | Calculate total costs, flexibility value |
| Education | ROI varies by field and institution |
| Saving | Time value of money, compound growth |
Understanding News
When you hear economic news, ask:
- Who benefits? Who loses?
- What are the trade-offs?
- What are the second-order effects?
- What incentives does this create?
Economic Schools of Thought
| School | Core Belief | Policy Preference |
|---|---|---|
| Keynesian | Demand-driven; government should stabilize | Active fiscal policy |
| Monetarist | Money supply is key | Stable monetary policy |
| Austrian | Markets self-correct; interventions backfire | Minimal intervention |
| Supply-side | Incentives drive growth | Low taxes, deregulation |
| MMT | Sovereign governments can print without constraint | Aggressive spending |
Reality: Each has insights; none is complete.
Recommended Resources
Books
| Book | Author | Level |
|---|---|---|
| Economics in One Lesson | Henry Hazlitt | Beginner |
| Basic Economics | Thomas Sowell | Beginner |
| Naked Economics | Charles Wheelan | Beginner |
| The Undercover Economist | Tim Harford | Beginner |
| Principles of Economics | Mankiw | Textbook |
Following Economics
- The Economist (magazine)
- Financial Times
- Planet Money (podcast)
- Marginal Revolution (blog)
- FRED (data)
Key Takeaways
- Incentives drive behavior - Follow the incentives to predict outcomes
- Everything has a cost - Opportunity cost is real even when invisible
- Trade-offs are unavoidable - There's no policy with only benefits
- Markets work (mostly) - But can fail; government helps and hurts
- Unintended consequences - Every policy has effects beyond intention
- Thinking on the margin - Decisions are about next unit, not all-or-nothing
- Long-run vs. short-run - Effects differ over time horizons