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Home›The Economy›Economic Foundations›Supply & Demand
◆ ECONOMIC FOUNDATIONS

Supply & Demand

Supply, demand, equilibrium, price signals, and elasticity.

24 articles

Featured

Surplus: When Supply Exceeds Demand and What Happens Next

A surplus occurs when the quantity supplied at a given price exceeds the quantity demanded.

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Deep Dives

11 articles
◆ SUPPLY & DEMAND

The Law of Demand: Why Price and Quantity Move in Opposite Directions

The law of demand states that as price rises, quantity demanded falls, but the two mechanisms behind that relationship are more instructive than the rule itself.

9 min read·February 27, 2026
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◆ SUPPLY & DEMAND

The Law of Supply: Why Producers Offer More When the Price Rises

The law of supply: quantity offered rises with price. A clear anatomy of the curve, the six determinants that shift it, and why the time horizon changes everything.

9 min read·February 28, 2026
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◆ SUPPLY & DEMAND

How Markets Find Their Price: Solving for Equilibrium

Where supply meets demand: step-by-step equilibrium math, a surplus/shortage table, and comparative statics showing exactly how curve shifts move price and…

10 min read·March 1, 2026
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◆ SUPPLY & DEMAND

What Actually Shifts Supply and Demand (And What Doesn't)

Five factors shift demand, five shift supply. Learn what actually moves entire curves — versus what simply moves quantity along them.

9 min read·March 2, 2026
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◆ SUPPLY & DEMAND

How Prices Carry Information: The Coordination System No One Designed

Prices do more than report costs — they aggregate dispersed knowledge and coordinate millions of strangers without a central director.

9 min read·March 3, 2026
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◆ SUPPLY & DEMAND

Price Elasticity of Demand: Measuring How Much Buyers Actually Care About Price

PED measures how much quantity falls when price rises. Learn the formula, the midpoint method, what drives elasticity, and why it determines every pricing and…

8 min read·March 4, 2026
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◆ SUPPLY & DEMAND

Elastic vs. Inelastic Demand: Two Markets, One Price Hike, Opposite Outcomes

Same price hike, opposite revenue results. Learn how elastic and inelastic demand differ, which real goods land on each side, and why every pricing and tax…

8 min read·March 6, 2026
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◆ SUPPLY & DEMAND

Income Elasticity and Cross-Price Elasticity: What Your Spending Reveals About Demand

YED and XED measure how demand shifts when income or a related good's price changes — with real data on food, luxury goods, and substitutes.

8 min read·March 7, 2026
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◆ SUPPLY & DEMAND

Price Elasticity of Supply: Why Markets Don't React Overnight

PES measures how quickly producers can raise output when prices rise. Time horizon is the dominant factor — and housing and oil show exactly why it matters.

7 min read·March 8, 2026
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◆ SUPPLY & DEMAND

How Elasticity Drives Pricing Decisions, Tax Policy, and Who Actually Pays

Elasticity determines whether a price increase raises or destroys revenue, which side of a market bears a tax, and how large the economic cost of that tax…

9 min read·March 9, 2026
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◆ SUPPLY & DEMAND
↔ Also in Government Intervention

What Happens When You Cap Prices Below Equilibrium: Rent Control and Shortages

A price cap below the market-clearing price doesn't make a good cheaper for everyone — it creates a shortage. Rent control is the textbook case.

7 min read·May 23, 2026
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◆ THE BROADSHEETThe terms behind the headlines, and where to read next.

Key terms

  • Tax Incidence: Who Actually Pays the Tax?Tax incidence describes the economic burden of a tax — who actually bears the cost, which may differ from who is legally required to pay it.
  • Substitutes and Complements: How Related Goods Move TogetherSubstitutes can replace each other — a price rise in one increases demand for the other. Complements are used together — a price rise in one decreases demand…
  • Price Ceiling: What Happens When Government Caps What Sellers Can ChargeA price ceiling is a legal maximum price below the market equilibrium. It protects buyers from high prices but creates shortages, non-price rationing, and…
  • Derived Demand: Why Labor Demand Is Always Second-HandDerived demand is demand for an input that exists only because of demand for the output it helps produce.
  • Price Floor: What Happens When Government Sets a Minimum PriceA price floor is a legal minimum price above the market equilibrium. It protects sellers from very low prices but creates surpluses — excess supply that…
  • Consumer Surplus: The Hidden Value Markets CreateConsumer surplus is the difference between what a buyer is willing to pay and what they actually pay.
  • Producer Surplus: The Value Sellers Capture Beyond Their Minimum PriceProducer surplus is the difference between the price a seller receives and the minimum price they would have accepted.
  • The Total Revenue Test: The Fastest Way to Identify Demand ElasticityThe total revenue test uses the direction of revenue change after a price change to determine whether demand is elastic or inelastic — no elasticity formula…
  • The Shortage Problem: When Demand Outruns SupplyA shortage occurs when quantity demanded at a given price exceeds quantity supplied. Free markets resolve shortages through rising prices; price ceilings lock…
  • Normal vs. Inferior Goods: How Income Changes What You BuyNormal goods see demand rise when income rises; inferior goods see demand fall. The distinction reveals how consumption patterns shift as living standards…
  • Income Elasticity of Demand: What Happens to Sales When Incomes RiseIncome elasticity of demand measures how much quantity demanded changes when consumer income changes.
  • Cross-Price Elasticity: Measuring the Relationship Between Related GoodsCross-price elasticity of demand measures how much quantity demanded of one good changes when the price of another good changes.

More in Economic Foundations

  • Economics Fundamentals10
  • Consumer Theory11
All of Economic Foundations →

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