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The Price Puzzle: What Drives the Market – Class 9 Social Science notes, important questions and MCQs

NCERT Class 9 Social Science, chapter 9. Notes, key terms, important questions with answers and MCQs.

Chapter overview

A market is any arrangement where buyers and sellers exchange goods and services. Prices are decided by the interaction of demand (what buyers want and can pay for) and supply (what sellers offer). When demand rises or supply falls, prices tend to rise; when demand falls or supply rises, prices tend to fall. Governments sometimes step in to control prices and protect consumers and farmers.

Demand

Demand is the quantity of a good that buyers are willing and able to buy at a given price.
Law of demand: other things remaining the same, when price rises, quantity demanded falls, and when price falls, quantity demanded rises.
Demand also depends on income, tastes, prices of related goods and expectations.

Supply

Supply is the quantity that sellers are willing to offer for sale at a given price.
Law of supply: other things remaining the same, when price rises, quantity supplied rises.
Supply depends on cost of production, technology, weather (for crops) and number of sellers.

Market price and government role

Equilibrium price is the price at which quantity demanded equals quantity supplied.
A shortage (demand more than supply) pushes prices up; a surplus (supply more than demand) pushes prices down.
The government announces Minimum Support Prices (MSP) for some crops and sells essential goods at fair prices through the Public Distribution System; inflation is a general rise in prices.

Key terms

Market: an arrangement in which buyers and sellers exchange goods and services
Demand: the quantity of a good buyers are willing and able to buy at a given price
Supply: the quantity of a good sellers are willing to sell at a given price
Equilibrium price: the price at which quantity demanded equals quantity supplied
Inflation: a general and sustained rise in the price level

Important questions with answers

State the law of demand.2 marks

The law of demand states that, other things remaining the same, when the price of a good rises, the quantity demanded falls, and when the price falls, the quantity demanded rises. There is an inverse relationship between price and quantity demanded.

How are market prices determined?3 marks

Market prices are determined by the interaction of demand and supply. When quantity demanded is greater than quantity supplied, there is a shortage and price rises. When quantity supplied is greater than quantity demanded, there is a surplus and price falls. The price settles where demand equals supply, called the equilibrium price.

Explain how demand and supply determine prices in a market and why the government sometimes intervenes.5 marks

A market is any arrangement where buyers and sellers exchange goods and services. Demand is the quantity buyers are willing and able to buy at a given price; according to the law of demand, other things remaining the same, quantity demanded falls when price rises and rises when price falls. Demand also depends on income, tastes, prices of related goods and expectations. Supply is the quantity sellers are willing to sell at a given price; according to the law of supply, quantity supplied rises when price rises. Supply depends on cost of production, technology, weather and the number of sellers. The market price settles at the equilibrium price, where quantity demanded equals quantity supplied. If demand is more than supply, there is a shortage and prices rise; if supply is more than demand, there is a surplus and prices fall. For example, onion prices rise sharply when heavy rain destroys the crop. Markets do not always protect everyone, so the government intervenes. It announces Minimum Support Prices to protect farmers from very low prices, supplies essential goods at fair prices through the Public Distribution System to protect poor consumers, keeps buffer stocks, and acts against hoarding and black marketing. The Reserve Bank and government also try to control inflation.

Quick revision

Law of demand: price up, demand down.
Law of supply: price up, supply up.
Equilibrium: demand equals supply.
Shortage raises prices; surplus lowers prices.

Exam tips

Use a simple table of prices and quantities to explain the laws of demand and supply.
Link real examples: onion prices rise when supply falls after heavy rain.

Practice MCQs

A place or system where buyers and sellers exchange goods is a
1. factory
2. market
3. farm
4. bank only
Show answer
Answer: (b) market. It may be physical or online.
According to the law of demand, when the price of a good rises, quantity demanded
1. rises
2. falls
3. stays the same always
4. doubles
Show answer
Answer: (b) falls. Other things remain the same.
According to the law of supply, when price rises, quantity supplied
1. falls
2. becomes zero
3. rises
4. stays fixed always
Show answer
Answer: (c) rises. Sellers earn more per unit.
The price at which demand equals supply is the
1. maximum price
2. cost price
3. equilibrium price
4. support price
Show answer
Answer: (c) equilibrium price. There is no shortage or surplus.
When demand is greater than supply, there is a
1. shortage
2. surplus
3. equilibrium
4. loss of demand
Show answer
Answer: (a) shortage. Prices tend to rise.
The price at which the government buys certain crops from farmers is the
1. retail price
2. market rate always
3. equilibrium price
4. Minimum Support Price
Show answer
Answer: (d) Minimum Support Price. It protects farmers' income.
Heavy rains destroy the onion crop. What is most likely to happen to onion prices
1. they fall
2. they remain the same
3. they rise because supply falls
4. onions become free
Show answer
Answer: (c) they rise because supply falls. Lower supply with the same demand raises prices.
A general and sustained rise in the price level in an economy is called
1. inflation
2. deflation
3. equilibrium
4. subsidy
Show answer
Answer: (a) inflation. It reduces the purchasing power of money.

All chapters of Class 9 Social Science

Written by Kundali IQ from standard, well-established facts to help with revision. This is not an official NCERT publication; always read your textbook too.