Class 9 Social Science Chapter 9, The Price Puzzle: What Drives the Market, asks why mangoes are half price a week later, why vegetables are cheaper in the evening, and why the same flight seat costs ₹3,000 one day and ₹9,000 another. It answers with demand, supply, market equilibrium and the role of government.
What Class 9 Social Science Chapter 9 Covers
Demand and its other determinants: prices of related goods, the consumer’s income, taste and preference, seasonality and expected future prices.
Supply and its determinants: the number of sellers, technology and future expectations, with a chickpea and wheat price example.
Market Equilibrium and whether it exists in the real world.
Role of Government in the Economy covers regulating unfair practices, providing public goods, and the limits of intervention.
Examples from the chapter: Srivalli’s demand for a fruit rises by 2 kg when its price falls from ₹150 to ₹50, but the market demand curve is flatter because many buyers respond together. Eating mango after mango shows diminishing marginal utility, where each extra one gives less satisfaction. Hotel prices that change by the day show supply and demand at work. Regulators such as the Reserve Bank of India and the Central Consumer Protection Authority, along with fixed bus fares, medicine prices and minimum wages, show the government stepping in.
Exercises in Chapter 9
- Questions and activities at the end of the chapter, after a Before we move on… recap.
Read Class 9 Social Science Chapter 9 Online
More Chapters
- Previous: Chapter 8: Building Blocks in Economics: The Problem of Choice
- All Social Science chapters and the other Class 9 books: Class 9 NCERT books 2026-27
- All Class 1 to 12 NCERT Textbooks: NCERT Books PDF (Class 1–12)
FAQ
What is market equilibrium?
The price at which the quantity buyers want equals the quantity sellers offer. Chapter 9 also asks whether real markets ever settle there.
What affects demand besides price?
The prices of related goods, the buyer’s income, taste and preference, the season, and expectations about future prices.
What is diminishing marginal utility?
The extra satisfaction from each additional unit of something, such as another mango, keeps falling as you consume more.