Download The Price Puzzle: What Drives the Market – NCERT Class 9 Social Science Chapter 9 PDF from the new NCERT Class 9 Social Science book Understanding Society: India and Beyond (2026-27). Read the chapter online or download the free PDF. Demand is the quantity of a product people are willing and able to buy at a particular price. Willingness alone is not demand — it must be backed by purchasing power. The Law of Demand is the inverse relation between price and quantity demanded:…
The Price Puzzle: What Drives the Market PDF – Chapter 9 of Understanding Society: India and Beyond (Part I)
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| Chapter | Download | |
|---|---|---|
| Chapter 9 PDF | The Price Puzzle: What Drives the Market | View PDF |
| Full book | NCERT Class 9 Social Science – Understanding Society: India and Beyond | View Book |
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What Is in The Price Puzzle: What Drives the Market? (Class 9 Social Science Chapter 9)
- Demand is the quantity of a product people are willing and able to buy at a particular price. Willingness alone is not demand — it must be backed by purchasing power. The Law of Demand is the inverse relation between price and quantity demanded: Srivalli buys 1 kg at ₹150, 2 kg at ₹100 and 3 kg at ₹50 (Fig. 9.2), which is why the demand curve DD’ slopes downward.
- Market demand is the sum of all individual demands. Table 9.1 adds Srivalli, Alex and Israt: at ₹150 → 1+2+3 = 6 kg, at ₹100 → 2+4+6 = 12 kg, at ₹50 → 3+6+9 = 18 kg. Because many buyers respond together, the market demand curve DmDm’ is flatter than any one buyer’s curve.
- Price is only one determinant. Demand also changes with the price of related goods (substitutes like tea and coffee; complements like cars and petrol), income, taste and preference, the size and composition of the population, seasonality and future price expectations. A price change moves you along the curve; any of these others shifts the whole curve.
- Supply is the quantity sellers are willing and able to offer at a particular price, and the Law of Supply is a direct relation — higher prices raise profitability, so output rises and new firms enter. Table 9.2 sums three sellers: at ₹50 → 1+3+2 = 6 kg, at ₹100 → 2+4+6 = 12 kg, at ₹150 → 3+7+8 = 18 kg. Supply also depends on the price of related goods (wheat versus chickpea, Fig. 9.6), the number of sellers, technology and future expectations.
- Market equilibrium is the price at which quantity demanded equals quantity supplied — for the chapter’s mangoes, ₹100 and 12 kg (Table 9.3, Fig. 9.7). Below it there is excess demand (a shortage) and the price is bid up; above it there is excess supply (a surplus) and the price is pushed down. In the real world equilibrium never settles — the COVID-19 mask market and a Goa hotel’s tariff moving from ₹1,500 to ₹8,000 to ₹25,000 show markets always adjusting.
- Governments intervene because markets allocate by willingness and ability to pay: through price ceilings (maximum prices, as on sanitisers at ₹100 for 200 ml under the Essential Commodities Act, 1955), price floors (minimum wages), regulators such as RBI, CCPA, TRAI and SEBI, and the provision of public goods that no private firm would supply. But intervention has limits — price distortions, compliance burdens and weaker incentives to innovate.
Quick revision – The Price Puzzle: What Drives the Market
| Term | What it means | Where it appears in the chapter | What the chapter says about it |
|---|---|---|---|
| Demand | The quantity of a product people are willing and able to buy at a particular price | Page 196, section Demand | Depends on needs, preferences, season, trend and income; it is willingness plus ability to pay |
| Purchasing power | A measure of how much one unit of a currency can buy at a particular time | Page 196, margin | Desire alone is not demand — it must be backed by purchasing power |
| Law of Demand | Price up → quantity demanded down; price down → quantity demanded up | Page 196, Fig. 9.1 | The inverse relationship between price and quantity demanded; it is why DD’ slopes downward |
| Individual demand | What one consumer wants to buy at different prices, other things constant | Page 196, Fig. 9.2 | Srivalli: 1 kg at ₹150, 2 kg at ₹100, 3 kg at ₹50 |
| Demand schedule / demand curve | The table of price–quantity pairs, and the same table drawn as a graph | Page 196, Fig. 9.2 (a) and (b) | Points A, B and C joined give the downward-sloping line DD’ |
| Market demand | The sum of all individual demands at each price | Page 197, Table 9.1 | Q1+Q2+Q3 → 6 kg at ₹150, 12 kg at ₹100, 18 kg at ₹50 |
| Related goods | Goods whose demand is interconnected | Page 198, margin | A change in the price or availability of one directly affects demand for the other |
| Substitute goods | Goods that can replace each other | Page 198 | Tea and coffee; if coffee gets dearer, demand for tea rises |
| Complementary goods | Goods generally used together | Page 198 | Smartphones and earphones; cars and petrol; cinema tickets and popcorn |
| Diminishing marginal utility | The extra usefulness from each additional unit falls as more is consumed | Page 199, THINK ABOUT IT | The first mango is delicious, the fourth is not — so willingness to pay falls and demand falls |
| Supply | The quantity sellers are willing and able to offer at a particular price | Page 200, section Supply | Higher prices raise profitability, so output rises and new firms are attracted |
| Law of Supply | Price up → quantity supplied up; price down → quantity supplied down | Page 200, Fig. 9.4 | A direct relationship, giving an upward-sloping supply curve |
| Market supply | The sum of all individual supplies at each price | Page 201, Table 9.2 | A+B+C → 6 kg at ₹50, 12 kg at ₹100, 18 kg at ₹150 |
| Market equilibrium | The point where quantity supplied equals quantity demanded | Page 203, margin and Table 9.3 | Equilibrium price ₹100, equilibrium quantity 12 kg; the market is ‘cleared’ |
Old NCERT vs New – Class 9 Social Science
This chapter is from Understanding Society: India and Beyond, the new NCERT Class 9 Social Science book (NCF-SE 2023, used from 2026-27). It replaced the old book “India and the Contemporary World, Contemporary India, Democratic Politics and Economics”, so chapter numbers and names differ from older PDFs.
Solutions and All Chapters
Answers to the exercises and the full chapter list of Understanding Society: India and Beyond:
The Price Puzzle: What Drives the Market – Overview
| Class | Class 9 |
| Subject | Social Science |
| Book | Understanding Society: India and Beyond – new NCERT book |
| Part | Part I |
| Chapter | 9 of 15 – The Price Puzzle: What Drives the Market |
| Book pages | 195 – 213 |
| Edition | Latest NCERT edition (2026-27) |
| Session | 2026-27 |
| Free – read online or download |
Class 9 Social Science Chapter 9 – FAQs
Where can I download The Price Puzzle: What Drives the Market Class 9 PDF?
From the download table on this page – the chapter PDF is free, and the full book is linked too.
What is Class 9 Social Science Chapter 9 about?
Demand is the quantity of a product people are willing and able to buy at a particular price. Willingness alone is not demand — it must be backed by purchasing power. The Law of Demand is the inverse relation between price and quantity demanded: Srivalli buys 1 kg at ₹150, 2 kg at ₹100 and 3 kg at ₹50 (Fig. 9.2), which is why the demand curve DD’ slopes downward.
Is The Price Puzzle: What Drives the Market from the new NCERT Class 9 Social Science book?
Yes. It is chapter 9 of understanding society: india and beyond (part i), the new NCERT Class 9 Social Science book for 2026-27.
Is this the latest NCERT edition for 2026-27?
Yes – the PDF is NCERT’s latest edition for the 2026-27 session.
Where are the NCERT Solutions for Class 9 Social Science Chapter 9?
Open the NCERT Solutions link above for answers to the exercise questions.