◆ THE ECONOMY
How economies actually work
Markets, firms, prices, and policy — the forces shaping every dollar in your world.
The Economics Foundation
How economists actually think — scarcity, prices, firms, and markets, built up from the ground. Jump in anywhere.
Start withThe Coase Theorem: When Private Bargaining Solves What Regulation Can't
Ronald Coase showed that if property rights are clear and bargaining is cheap, private parties can solve externalities themselves — and where that breaks.
Read more →- Nudge Theory: Designing Choice Environments to Improve Decisions Without Mandating Them
- Monopoly Pricing: Why Less Output Always Means Higher Prices
- Why Competition Drives Economic Profits to Zero — and What That Tells Investors
- Average Cost vs. Marginal Cost: The Two Numbers That Drive Every Output Decision
- Inside a Firm's Costs: Fixed, Variable, and Total — and Why the Difference Matters
- Present Bias: Why You Value Today So Much More Than Tomorrow — and What It Costs You
- Natural Monopoly and Regulation: Should You Let One Firm Win — or Control What It Charges?
Browse by category
How Money Works
All of How Money Works →Start at the source — inflation, interest, the Fed, and the forces moving every dollar.
Economic Foundations
All of Economic Foundations →The economic way of thinking — scarcity, prices, choice, and how markets coordinate.
Start withSurplus: When Supply Exceeds Demand and What Happens Next
A surplus occurs when the quantity supplied at a given price exceeds the quantity demanded.
Read more →- What Actually Shifts Supply and Demand (And What Doesn't)
- Cross-Price Elasticity: Measuring the Relationship Between Related Goods
- Inside Indifference Curves: What Consumer Preferences Look Like on a Graph
- Normal vs. Inferior Goods: How Income Changes What You Buy
- Indifference Curves: Mapping Consumer Preferences
- Opportunity Cost: The Price of Every Decision You Make
- Inside the Supply Curve: What Each Part Actually Means
Firms & Markets
All of Firms & Markets →How firms produce and compete — costs, market structures, labor, and the factors of production.
Start withAverage Total Cost: The Cost Per Unit That Determines Profitability
Average total cost (ATC) is total cost divided by quantity produced — the cost per unit of output.
Read more →- What Is Perfect Competition? The Market Structure That Sets the Benchmark
- Should You Shut Down or Exit? The Economics of When to Stop Producing
- The MR = MC Rule: How Firms Find the Profit-Maximizing Output
- Factors of Production: The Four Inputs Behind Everything Made
- What Is Monopolistic Competition? The Market Structure Most Businesses Actually Live In
- The Production Function: What Comes Out When You Put Inputs In
- Long-Run Equilibrium: Where Competition Eventually Takes Every Market
Market Failures & Policy
All of Market Failures & Policy →Where markets break and what to do about it — externalities, information, and government intervention.
Start withThe Principal-Agent Problem: When Your Representative Has Different Interests
The principal-agent problem arises when one party (the principal) hires another (the agent) to act on their behalf, but the agent has different interests and…
Read more →- Moral Hazard: When Insurance Changes Behavior
- Price Floors vs. Market Outcomes: Minimum Wage, Surpluses, and Who Gains
- Signaling and Screening: How Markets Overcome Information Gaps
- Pigovian Taxes and Subsidies: Putting a Price on What the Market Ignores
- Market Failure: When Markets Produce the Wrong Outcome
- The Market for Lemons: How Bad Products Drive Out Good Ones
- The Tragedy of the Commons: When Shared Resources Are Destroyed
Global & Applied
All of Global & Applied →Economics in the wild — trade, inequality, and the markets that shape daily life.
Start withIncome Distribution: How a Country's Income Is Divided
Income distribution describes how total national income is divided among households and individuals.
Read more →- Comparative Advantage: The Principle Behind Every Trade Relationship on Earth
- Switching Costs: The Friction That Keeps Customers Locked In
- Absolute vs. Comparative Advantage: The Distinction That Explains Trade
- Transfer Payment: Income Without a Corresponding Production Requirement
- Platform Economics: The Two-Sided Markets That Reshape Industries
- What Drives Income Inequality? The Economics Behind the Gap
- Gini Coefficient: The Number That Measures Inequality
Investing & Wealth↔ bridges both
All of Investing & Wealth →Putting money to work and keeping more of it — investing, retirement, taxes.
Start withHow Income Tax Works: Understanding the US Tax System
Comprehensive guide to US income taxation: brackets, marginal vs. effective rates, deductions, and tax calculation mechanics.
Read more →- Side Hustles: Monetizing Skills, Tax Implications, Time Management, and Scaling
- Index Funds & ETFs
- Charitable Giving Strategies: Tax-Advantaged Ways to Amplify Your Impact
- What Is a Portfolio?
- How Income Tax Actually Works — Brackets, Deductions, and the Refund Myth
- When to Start Investing
- How Bonds Really Work: Beyond "Safe"
Common questions
What Is Hyperinflation?
Extreme, rapid inflation where prices rise hundreds or thousands of times in months, destroying savings and currency value. Learn from real hyperinflation…
Read more →Price Floor: What Happens When Government Sets a Minimum Price
A price floor is a legal minimum price above the market equilibrium. It protects sellers from very low prices but creates surpluses — excess supply that…
Read more →Comparative Advantage: Why Countries Trade Even When One Is Better at Everything
Comparative advantage is the ability to produce a good at a lower opportunity cost than a trading partner.
Read more →The Coase Theorem: When Private Bargaining Solves Externalities
The Coase Theorem states that when property rights are clearly defined and transaction costs are zero, private bargaining will produce an efficient outcome…
Read more →Allocative vs. Productive Efficiency: Two Ways Markets Can Get It Right
Allocative efficiency means resources go to their highest-valued uses (P = MC). Productive efficiency means goods are produced at minimum cost.
Read more →What Is a Bear Market?
A market where stock prices fall 20%+ from recent highs, characterized by pessimism and selling pressure.
Read more →