NCERT Class 12 Economics Introductory Microeconomics: Chapter 5 — Price
This chapter builds upon previous discussions of consumer and firm behavior, focusing on market equilibrium in perfectly competitive markets. It defines equilibrium as a state where market demand equals market supply, determined by the intersection of the demand (DD) and supply (SS) curves. The price at this intersection is the equilibrium price (p*), and the quantity is the equilibrium quantity (q*). The chapter explains concepts of excess demand (demand > supply) and excess supply (supply > demand) and how the 'Invisible Hand' mechanism adjusts prices to reach equilibrium. It also touches upon the effects of shifts in demand and supply curves on equilibrium price and quantity, and introduces applications of demand-supply analysis. Understanding market equilibrium is crucial for analyzing how prices and quantities are determined in a market economy.
Quick info
| Board | CBSE / NCERT |
|---|---|
| Class | Class 12 |
| Subject | Economics |
| Book | Introductory Microeconomics |
| Chapter | Chapter 5 — Price |
| Language | English |
| PDF type | NCERT Textbook |
| Session | CBSE 2026 |
| Reading time | 5 minutes |
| Word count | 925 |
Learning outcomes
- Define market equilibrium and identify the equilibrium price and quantity.
- Explain the concepts of excess demand and excess supply.
- Understand the role of the 'Invisible Hand' in price adjustment.
- Analyze the impact of shifts in demand and supply on market equilibrium.
- Apply demand-supply analysis to real-world market situations.
Vocabulary
| Word | Meaning |
|---|---|
| Market Equilibrium | A situation where market demand equals market supply. |
| Equilibrium Price | The price at which market demand equals market supply. |
| Equilibrium Quantity | The quantity bought and sold at the equilibrium price. |
| Excess Demand | A situation where market demand exceeds market supply at a given price. |
| Excess Supply | A situation where market supply exceeds market demand at a given price. |
| Invisible Hand | A metaphor for the self-regulating nature of the marketplace. |
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Practice questions
- What is market equilibrium? Answer: Market equilibrium is a situation where the quantity demanded by consumers equals the quantity supplied by firms.
- What happens if the market price is above the equilibrium price? Answer: If the market price is above the equilibrium price, there will be excess supply.
- What happens if the market price is below the equilibrium price? Answer: If the market price is below the equilibrium price, there will be excess demand.
- Who is credited with the concept of the 'Invisible Hand'? Answer: Adam Smith is credited with the concept of the 'Invisible Hand'.
Practice MCQs
Q1. Market equilibrium occurs when:
Explanation: Market equilibrium is defined as the point where the quantity demanded by consumers precisely matches the quantity supplied by firms.
Q2. If the price is above the equilibrium price, what is observed in the market?
Explanation: When the price is higher than the equilibrium price, producers are willing to supply more than consumers are willing to buy, leading to excess supply.
Q3. The 'Invisible Hand' mechanism primarily works to:
Explanation: The 'Invisible Hand' is conceptualized to adjust prices upwards during excess demand and downwards during excess supply, guiding the market towards equilibrium.
Q4. The equilibrium quantity is determined at:
Explanation: The equilibrium quantity is the quantity traded at the equilibrium price, which is found at the intersection of the market demand and market supply curves.
Q5. What does 'qD(p*) = qS(p*)' represent in the context of market equilibrium?
Explanation: This equation signifies that at the equilibrium price (p*), the quantity demanded (qD) is exactly equal to the quantity supplied (qS).
Frequently asked questions
What is the core concept of Chapter 5 of Introductory Microeconomics?
Chapter 5 focuses on Market Equilibrium, explaining how the interaction of demand and supply determines prices and quantities in a perfectly competitive market.
How is equilibrium price determined?
The equilibrium price is determined at the point where the market demand curve intersects the market supply curve, meaning the quantity demanded equals the quantity supplied.
What is excess demand?
Excess demand occurs when, at a given price, the quantity consumers wish to buy is greater than the quantity firms are willing to sell.
What is excess supply?
Excess supply occurs when, at a given price, the quantity firms wish to sell is greater than the quantity consumers are willing to buy.
What role does the 'Invisible Hand' play in market equilibrium?
The 'Invisible Hand' is a concept suggesting that market forces automatically adjust prices to eliminate excess demand or excess supply, guiding the market towards equilibrium.
What happens to equilibrium if demand or supply shifts?
Shifts in either the demand or supply curve will lead to a new intersection point, resulting in a new equilibrium price and quantity.
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NCERT Class 12 Economics — Introductory Microeconomics — Chapter 5 — Price. Verified by NCERT Help Editorial Team. Reviewed on 29 Jul 2026. Last updated 10 Aug 2026.