Microeconomics
60 lessons in this hub.
Asymmetric Information: Lemons, Adverse Selection, and Signaling
Learn asymmetric information: Akerlof's lemons model, adverse selection in insurance, moral hazard, and how signaling and screening restore trade.
Lesson · Intermediate · 6 minAverage Cost Curves: AFC, AVC, and ATC
Dissect per-unit costs: why average fixed cost always falls, why AVC and ATC are U-shaped, and how the three curves fit together.
Lesson · Foundations · 5 minBudget Constraints: What Consumers Can Afford
Draw and interpret the budget line, read its slope as the opportunity cost of consumption, and see how income and price changes move it.
Lesson · Intermediate · 9 minCapital Markets: Interest, Investment, and Present Value
Learn capital markets: present value and discounting, how interest rates balance saving and investment, and how firms decide what to build.
Lesson · Intermediate · 9 minCartels: How Firms Collude and Why Cartels Fail
Learn what cartels are, why firms form them to mimic monopoly profits, the cheating incentive that destabilizes them, and how antitrust law fights them.
Lesson · Foundations · 8 minCommon Resources and the Tragedy of the Commons
Learn why shared rival resources get overused: the tragedy of the commons in fisheries and groundwater, and solutions from quotas to Ostrom's design principles.
Lesson · Intermediate · 7 minConsumer Equilibrium: The Optimal Consumption Bundle
Find the utility-maximizing bundle where the budget line touches the highest indifference curve, and see why MRS must equal the price ratio.
Lesson · Foundations · 7 minConsumer Surplus: The Value Buyers Get Beyond the Price
Consumer surplus is the gap between what buyers would pay and what they pay. Learn to measure it as the triangle under demand.
Lesson · Foundations · 6 minCosts in Economics: A Complete Overview
Map the whole cost landscape: opportunity cost, explicit vs implicit costs, and why economic profit differs from accounting profit.
Lesson · Foundations · 7 minCross Elasticity of Demand: Substitutes, Complements, and Rivals
Cross elasticity = % change in quantity of A / % change in price of B. Positive means substitutes, negative means complements.
Lesson · Foundations · 8 minDeadweight Loss: The Welfare Cost of Distorted Markets
Deadweight loss is total surplus destroyed when quantity moves away from equilibrium. Learn its triangle, its causes, and the efficiency-equity trade-off.
Lesson · Foundations · 6 minDemand Basics: Schedules, Curves, and Market Demand
Demand is the relationship between price and quantity demanded, holding other things equal. Learn schedules, curves, and how individual demands add up.
Lesson · Foundations · 5 minThe Law of Diminishing Marginal Returns
Why adding more workers to fixed machines eventually yields smaller output gains - the short-run law that sits behind rising marginal cost.
Lesson · Intermediate · 5 minDiseconomies of Scale: When Bigger Gets Expensive
Learn why long-run average cost eventually rises: coordination costs, bureaucracy, and stretched management - plus constant returns in between.
Lesson · Foundations · 6 minEconomic Systems: Market, Command, Mixed, and Traditional
Every society must answer what, how, and for whom to produce. Compare how market, command, mixed, and traditional systems answer those questions.
Lesson · Intermediate · 6 minEconomies of Scale: Why Bigger Can Be Cheaper
Discover why long-run average cost falls as firms grow: specialization, indivisible inputs, bulk buying, and the minimum efficient scale.
Lesson · Foundations · 6 minElasticity Overview: Measuring Responsiveness in Markets
Elasticity measures how strongly one variable responds to another. Tour the four elasticities and the elastic vs. inelastic vocabulary.
Lesson · Foundations · 8 minExternalities Basics: When Markets Affect Bystanders
Learn externalities: costs and benefits that fall on third parties, why they cause market failure, and the toolkit of remedies from taxes to property rights.
Lesson · Foundations · 8 minFactor Markets: The Demand and Supply of Inputs
Learn factor markets: derived demand, marginal revenue product, the least-cost input rule, and what shifts firms' demand for labor and capital.
Lesson · Foundations · 5 minFixed vs Variable Costs: The Short-Run Split
Learn to split short-run cost into fixed and variable components, see how each behaves as output changes, and why the distinction vanishes in the long run.
Lesson · Foundations · 8 minGame Theory Introduction: Players, Strategies, and Payoffs
A beginner-friendly introduction to game theory: players, strategies, payoff matrices, dominant strategies, and how economists model strategic interaction.
Lesson · Foundations · 7 minIncome Elasticity of Demand: Normal vs. Inferior Goods
Income elasticity = % change in quantity / % change in income. Positive means normal, negative means inferior -- and size separates luxuries from necessities.
Lesson · Intermediate · 7 minIndifference Curves: Mapping Consumer Preferences
Learn the four properties of indifference curves, what convexity means, and how the marginal rate of substitution measures willingness to trade.
Lesson · Foundations · 9 minLabor Markets: How Wages and Employment Are Determined
Learn competitive labor markets: labor demand from MRP, labor supply and the backward-bending curve, equilibrium, unions, and efficiency wages.
Lesson · Advanced · 8 minLand Rents and Economic Rent: Paying for Fixed Supply
Learn economic rent: why fixed-supply factors earn surpluses, Ricardo's differential rent, quasi-rents, and the case for taxing land.
Lesson · Foundations · 7 minThe Law of Demand: Why Higher Prices Mean Lower Quantities
The law of demand says price and quantity demanded move in opposite directions. Learn the substitution effect, income effect, and diminishing marginal utility behind it.
Lesson · Foundations · 6 minThe Law of Supply: Why Higher Prices Bring Forth More Output
The law of supply says price and quantity supplied move together. Learn the profit motive, rising marginal cost, and time horizons.
Lesson · Intermediate · 7 minMarginal Cost: The Cost of One More Unit
Define marginal cost, learn why it is U-shaped, and see why it crosses average cost curves exactly at their minimum points.
Lesson · Foundations · 6 minMarginal Utility and the Consumer's Spending Rule
Define marginal utility, see why it diminishes, and master the MU-per-dollar rule that tells rational consumers how to split any budget.
Lesson · Foundations · 7 minMarket Equilibrium: Where Supply Meets Demand
Equilibrium is the price where quantity demanded equals quantity supplied. Learn how markets find it, what disturbs it, and how they adjust.
Lesson · Intermediate · 9 minMonopolistic Competition: Many Sellers, Differentiated Products
Learn how monopolistic competition blends monopoly and competition: many firms, differentiated products, easy entry, and why long-run profits fall to zero.
Lesson · Intermediate · 8 minMonopoly Basics: The Single-Seller Market
Meet the polar opposite of competition: what defines a monopoly, how barriers protect it, why it restricts output, and where the welfare loss comes from.
Lesson · Intermediate · 9 minMonopsony: When There Is Only One Buyer
Learn monopsony — market power on the buying side: how a single employer suppresses wages, the MFC vs. supply distinction, and minimum-wage effects.
Lesson · Advanced · 10 minNash Equilibrium: When No One Wants to Deviate
Learn Nash equilibrium: the core solution concept of game theory, how to find it with best responses, mixed strategies, and multiple equilibria.
Lesson · Intermediate · 9 minNatural Monopoly: When One Firm Serves the Market Cheapest
Understand natural monopoly: declining average costs, why competition would be wasteful, and how regulators handle pricing through cost-based rules and price caps.
Lesson · Foundations · 8 minNegative Externalities: Pollution, Congestion, and Corrective Taxes
Learn negative externalities: why polluters overproduce, how Pigouvian taxes and cap-and-trade restore efficiency, and real cases from carbon to congestion.
Lesson · Intermediate · 10 minOligopoly Basics: Few Sellers and Strategic Interdependence
Understand oligopoly: few large firms, high barriers to entry, and why each firm's pricing and output decisions depend on rivals' expected reactions.
Lesson · Foundations · 6 minOpportunity Cost: The True Cost of Every Decision
Opportunity cost is the value of the best alternative you give up when you choose. Master explicit vs. implicit costs, sunk costs, and marginal thinking.
Lesson · Intermediate · 8 minPerfect Competition: The Price-Taking Market
Study the benchmark market structure: its assumptions, the firm's horizontal demand, short-run supply from MC, and long-run zero-profit equilibrium.
Lesson · Foundations · 8 minPositive Externalities: Benefits Markets Underprovide
Learn positive externalities: why education, vaccines, and R&D are underprovided, and how subsidies, patents, and public provision correct the gap.
Lesson · Foundations · 6 minThe Production Possibilities Curve (PPC): Visualizing Trade-offs
The PPC shows every efficient combination of two goods an economy can produce. Learn efficiency, increasing opportunity cost, and economic growth.
Lesson · Foundations · 7 minPrice Ceilings: When Governments Cap Prices Below Equilibrium
A binding price ceiling holds price below equilibrium, creating shortages. Learn rent control, non-price rationing, and black markets.
Lesson · Intermediate · 9 minPrice Discrimination: Charging Different Prices to Different Buyers
Learn first-, second-, and third-degree price discrimination: the conditions that make it possible, real examples, and its ambiguous welfare effects.
Lesson · Foundations · 8 minPrice Elasticity of Demand: The Midpoint Formula and Determinants
Price elasticity of demand = % change in quantity / % change in price. Master the midpoint method, determinants, and the total-revenue test.
Lesson · Foundations · 7 minPrice Floors: When Governments Hold Prices Above Equilibrium
A binding price floor holds price above equilibrium, creating surpluses. Learn minimum wage, farm price supports, and who wins and loses.
Lesson · Intermediate · 9 minThe Prisoner's Dilemma: Why Rational Choices Can Hurt Everyone
Master the prisoner's dilemma: dominant strategies, the tension between individual and collective rationality, and its applications from cartels to climate policy.
Lesson · Foundations · 7 minProducer Surplus: The Value Sellers Get Above Their Costs
Producer surplus is the gap between the price sellers receive and their minimum acceptable price. Learn to measure it above the supply curve.
Lesson · Intermediate · 6 minThe Production Function: Inputs Into Outputs
Meet Q = f(K, L): the technological recipe mapping labor, capital, and other inputs into the maximum output a firm can produce.
Lesson · Intermediate · 7 minProfit Maximization: The MR = MC Rule
Learn the universal profit rule - produce until marginal revenue equals marginal cost - why it works, and the conditions that make it a maximum.
Lesson · Foundations · 8 minPublic Goods: Non-Excludable, Non-Rival, and Underprovided
Learn public goods: the non-excludability and non-rivalry criteria, the free-rider problem, and why governments provide defense and basic research.
Lesson · Foundations · 6 minRevenue: Total, Average, and Marginal
Master TR, AR, and MR: why price-takers face MR = P, why MR falls below price with market power, and where total revenue peaks.
Lesson · Foundations · 5 minScarcity and Choice: Why Every Decision Has a Trade-off
Scarcity means unlimited wants meet limited resources, so every choice has a trade-off. Learn the foundational idea behind all of economics.
Lesson · Foundations · 7 minShifts vs. Movements: What Moves Along the Curve and What Moves the Curve
A price change moves along the curve; anything else shifts it. Master the demand and supply shifters and double-shift analysis.
Lesson · Foundations · 5 minShort Run vs Long Run in Production
Learn what really separates the short run from the long run - fixed versus variable inputs - and why the long-run cost curve envelopes the short-run ones.
Lesson · Foundations · 6 minShortages and Surpluses: Reading Market Disequilibrium
A shortage means quantity demanded exceeds quantity supplied; a surplus is the reverse. Learn to measure, graph, and predict how each resolves.
Lesson · Intermediate · 6 minThe Shutdown Decision: When to Stop Producing
Learn the short-run shutdown rule - produce only if price covers average variable cost - and why sunk fixed costs must be ignored.
Lesson · Foundations · 6 minSupply Basics: Schedules, Curves, and Market Supply
Supply is the relationship between price and quantity supplied, holding other things equal. Learn schedules, curves, and horizontal summation.
Lesson · Intermediate · 6 minTotal, Marginal, and Average Product
Master the TP/MP/AP trio: how marginal product is computed, why it crosses average product at its peak, and the three stages of production.
Lesson · Foundations · 5 minUtility: How Economists Measure Satisfaction
Learn what utility means in economics, how total utility is tracked in utils, and why economists model consumers as satisfaction-maximizers.
Lesson · Intermediate · 9 minWage Determination: Why Pay Differs Across Workers
Explore why wages differ: compensating differentials, human capital, signaling, efficiency wages, discrimination, and minimum-wage effects.