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Not investment advice. Educational reading. See Disclaimer.
L.1 · BEGINNER · 2 MIN

Supply, Demand & Market Prices

Every stock price, commodity price, and interest rate is set by supply and demand. Careful with the folk version, though: every executed trade has exactly one buyer and one seller, so buyers never literally 'outnumber' sellers. Prices rise when buyers are more EAGER — willing to pay up to sellers' higher asking prices — and fall when sellers are more anxious to get out than buyers are to get in.

Quiz · 5 questions ↓

What moves a price up or down, with market examples

ForceEffect on PriceStock Market Example
Demand increasesPrice risesEarnings beat expectations, buyers rush in
Demand decreasesPrice fallsBad news, investors sell
Supply increasesPrice fallsSecondary offering (more shares on market)
Supply decreasesPrice risesShare buybacks (fewer shares available)

Why price settles where supply meets demand

The equilibrium price is where supply equals demand. In the stock market, this changes every second as new information arrives and participants adjust their views.

Reading volume to see where buyers and sellers agree

Look at any ticker's volume bars on the chart. High volume at a price level shows where supply and demand found temporary agreement.

Why a stock price is a live consensus of a company's worth

Stock prices are not arbitrary numbers. They are the real-time consensus of millions of participants about what a company is worth, updated continuously.

What a small demand drop after a price rise reveals

A product's price rises 10% and demand falls only 2%. What does this tell you about the business?
Check your understanding

Sit with the ideas.

A pharmaceutical company announces its new drug failed clinical trials. What happens to the supply and demand balance for its stock?

Why:
Continue this lesson in the appAdaptive practice · saves your progress · remediation when you miss

Other lessons in this course.

  1. 01Supply, Demand & Market Prices— reading now
  2. 02Elasticity: Why Some Companies Have Pricing Power
  3. 03Opportunity Cost: The Hidden Price of Every Investment
  4. 04Costs of Production: Reading a Company's Margin Structure
  5. 05Perfect Competition: Why Commodity Businesses Struggle
  6. 06Monopoly Power: The Economics Behind Competitive Moats
  7. 07Monopolistic Competition: Brand Value and Differentiation
  8. 08Time Value of Money: Why a Dollar Today Beats a Dollar Later
  9. 09Externalities: ESG Risks and Regulatory Costs
  10. 10From Economics to Stock Analysis
  11. 11Industry Structure as Valuation Anchor
  12. 12Scarcity, PPF, and Opportunity Cost
  13. 13Marginal Analysis: How Disciplined Investors Decide
  14. 14Consumer and Producer Surplus: The Geometry of Value Capture
  15. 15Price Discrimination: First, Second, and Third Degree
  16. 16Game Theory and the Prisoner's Dilemma
  17. 17Externalities and Public Goods
  18. 18Comparative Advantage: Why Specialization Compounds
  19. 19Behavioral Economics for Investors
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