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The Price Puzzle : What Drives the Market
CBSE · Class 9 · Social Science
NCERT Solutions for The Price Puzzle : What Drives the Market — CBSE Class 9 Social Science.
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The Big Questions
1What are the factors that influence the demand for and supply of goods and services in a market?Show solution
The demand for goods and services is influenced by price, income of the consumer, prices of related goods (substitutes and complements), taste and preference, population size and composition, seasonality, future price expectations, and diminishing marginal utility. Demand also depends on purchasing power, meaning people must be willing and able to buy.
The supply of goods and services is influenced by price, prices of related goods, number of sellers in the market, technology, future expectations, and changes in weather, input costs, availability of resources, and other disruptions. In general, higher prices raise supply and lower prices reduce it.
The supply of goods and services is influenced by price, prices of related goods, number of sellers in the market, technology, future expectations, and changes in weather, input costs, availability of resources, and other disruptions. In general, higher prices raise supply and lower prices reduce it.
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2How are prices of goods and services determined through demand and supply interactions?Show solution
Prices are determined by the interaction of demand and supply. If demand is higher than supply, sellers can charge more, so prices rise. If supply is higher than demand, sellers reduce prices to sell more, so prices fall. When quantity demanded equals quantity supplied, the market reaches equilibrium, and the price becomes stable. So the market price adjusts until demand and supply balance each other.
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3What is market equilibrium, and does it exist in the real world?Show solution
Market equilibrium is the point where the quantity demanded equals the quantity supplied. At this point, there is neither excess demand nor excess supply, so the market is cleared and prices tend to remain stable.
In the real world, equilibrium does not stay fixed because markets are dynamic. Changes in technology, wages, weather, wars, pandemics, and other events keep shifting demand and supply. So markets are always moving toward a new equilibrium rather than remaining permanently at one point.
In the real world, equilibrium does not stay fixed because markets are dynamic. Changes in technology, wages, weather, wars, pandemics, and other events keep shifting demand and supply. So markets are always moving toward a new equilibrium rather than remaining permanently at one point.
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4How and why does the government intervene in the market?Show solution
The government intervenes in the market to make it fairer and more efficient. It does this because markets may fail to provide essential goods at affordable prices, may allow monopolies, or may involve unfair practices like hoarding and black-marketing.
Government intervention includes:
- Price ceiling on essential goods to prevent overcharging.
- Price floor such as minimum wages to protect workers.
- Regulation of monopolies and unfair trade practices.
- Provision of public goods like roads, parks, streetlights, defence, sanitation, and drainage.
It intervenes to protect consumers, workers, producers, and especially vulnerable and low-income groups, and to promote social welfare.
Government intervention includes:
- Price ceiling on essential goods to prevent overcharging.
- Price floor such as minimum wages to protect workers.
- Regulation of monopolies and unfair trade practices.
- Provision of public goods like roads, parks, streetlights, defence, sanitation, and drainage.
It intervenes to protect consumers, workers, producers, and especially vulnerable and low-income groups, and to promote social welfare.
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LET'S EXPLORE
1Create your own demand schedule for buying notebooks at different prices. At what price would you buy the most? At what price would you stop buying altogether? What could be the reason behind your choices?Show solution
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2Ask your family members if they postponed or advanced buying any product because of future expectations of changes in price?Show solution
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3What happens to the supply of a product in case of a change in the cost of inputs, discovery of an alternate input, depletion of resources, change in weather, disaster, etc.? Discuss in class using examples of diverse goods and services.Show solution
Changes in input costs, alternate inputs, resource depletion, weather, or disasters affect supply directly.
- If the cost of inputs rises, production becomes costlier, so supply falls.
- If a cheaper alternate input is discovered, production becomes easier or cheaper, so supply rises.
- If resources are depleted, producers cannot make as much, so supply falls.
- If weather is favourable, supply of farm products rises; if weather is bad or there is a disaster, supply falls.
For example, drought can reduce the supply of crops, while better irrigation or a new technology can increase supply.
- If the cost of inputs rises, production becomes costlier, so supply falls.
- If a cheaper alternate input is discovered, production becomes easier or cheaper, so supply rises.
- If resources are depleted, producers cannot make as much, so supply falls.
- If weather is favourable, supply of farm products rises; if weather is bad or there is a disaster, supply falls.
For example, drought can reduce the supply of crops, while better irrigation or a new technology can increase supply.
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4From your surroundings, list two goods or services that are provided by the government (for example: roads, streetlights, parks, police, and so on.). Choose one of the goods you listed and answer:Show solution
Two goods or services provided by the government are, for example, roads and streetlights.
If we choose roads:
- Who benefits? Everyone in the area benefits: pedestrians, cyclists, motorists, public transport users, businesses, and emergency services.
- Why is it difficult for a private company to provide it alone? Roads are public goods. Many people use them, and it is difficult to charge each person separately in a fair way. Private companies may also not earn enough direct profit.
- If the government stops providing it: People may face poor connectivity, slower transport, higher costs, accidents, and difficulty reaching schools, hospitals, and markets.
If we choose roads:
- Who benefits? Everyone in the area benefits: pedestrians, cyclists, motorists, public transport users, businesses, and emergency services.
- Why is it difficult for a private company to provide it alone? Roads are public goods. Many people use them, and it is difficult to charge each person separately in a fair way. Private companies may also not earn enough direct profit.
- If the government stops providing it: People may face poor connectivity, slower transport, higher costs, accidents, and difficulty reaching schools, hospitals, and markets.
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THINK ABOUT IT
1What happens when you consume the first mango? It tastes delicious, right? The second one is good? The third one and so on? You are barely interested in eating mangoes by this point. Why do you think this happens?Show solution
This happens because of diminishing marginal utility. The first mango gives the greatest satisfaction, but each additional mango gives less extra utility than the previous one. As the usefulness from more mangoes falls, the willingness to pay also falls, so demand decreases after a point.
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2Can you think of another real-life example (other than hotels) where prices change frequently? Explain why the prices keep changing.Show solution
One example is petrol prices, which often change frequently.
Prices keep changing because of changes in demand and supply, international oil prices, taxes, transport costs, and market expectations. When demand rises or supply falls, the price increases; when demand falls or supply rises, the price decreases.
Prices keep changing because of changes in demand and supply, international oil prices, taxes, transport costs, and market expectations. When demand rises or supply falls, the price increases; when demand falls or supply rises, the price decreases.
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3Have you ever seen or heard of the government fixing prices or wages (for example, bus fares, medicines, or minimum wages)? Share an example and why you think it was done.Show solution
Yes. For example, the government fixes minimum wages for workers.
This is done so that workers receive at least a fair income for their labour. It protects them from exploitation and ensures a basic standard of living. Similarly, the government may fix prices of medicines or bus fares to protect consumers from overcharging.
This is done so that workers receive at least a fair income for their labour. It protects them from exploitation and ensures a basic standard of living. Similarly, the government may fix prices of medicines or bus fares to protect consumers from overcharging.
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LET'S ANALYSE
1Using data from Table 9.3, plot the demand and supply curve at the three prices, i.e., ₹40, ₹100, and ₹150. Identify and mark excess demand and supply on the graph. Think about how equilibrium could be reached in these scenarios.Show solution
From Table 9.3:
- At ₹40, Qd = 38 kg and Qs = 6 kg.
- Since Qd > Qs, there is excess demand of kg.
- At ₹100, Qd = 12 kg and Qs = 12 kg.
- Since Qd = Qs, this is market equilibrium.
- At ₹150, Qd = 8 kg and Qs = 43 kg.
- Since Qs > Qd, there is excess supply of kg.
On the graph, plot demand points , , and supply points , , .
- The gap between demand and supply at ₹40 shows shortage, which pushes price upward.
- The gap at ₹150 shows surplus, which pushes price downward.
- The market moves toward equilibrium at ₹100 where demand and supply are equal.
- At ₹40, Qd = 38 kg and Qs = 6 kg.
- Since Qd > Qs, there is excess demand of kg.
- At ₹100, Qd = 12 kg and Qs = 12 kg.
- Since Qd = Qs, this is market equilibrium.
- At ₹150, Qd = 8 kg and Qs = 43 kg.
- Since Qs > Qd, there is excess supply of kg.
On the graph, plot demand points , , and supply points , , .
- The gap between demand and supply at ₹40 shows shortage, which pushes price upward.
- The gap at ₹150 shows surplus, which pushes price downward.
- The market moves toward equilibrium at ₹100 where demand and supply are equal.
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LET'S RECALL
1According to you, how should a democratic government decide when and how much it should intervene in markets to protect people's welfare?Show solution
A democratic government should intervene when markets fail to protect welfare, especially when essential goods become unaffordable, when there is monopoly power, or when unfair practices like hoarding and black-marketing occur. It should intervene only as much as needed, so that people are protected without creating unnecessary restrictions.
It should balance consumer welfare, producer incentives, and social equity. The goal should be to correct market failure, not to control every market decision.
It should balance consumer welfare, producer incentives, and social equity. The goal should be to correct market failure, not to control every market decision.
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2Whose voices should a democratic government consider while making such decisions—consumers, producers, workers, or others? Why?Show solution
A democratic government should consider the voices of consumers, producers, workers, and other affected groups.
- Consumers can explain affordability and access issues.
- Producers can explain costs, output, and incentives.
- Workers can explain wages and working conditions.
- Other groups, such as small businesses and vulnerable communities, may also be affected.
A democratic government should consider all these voices because market policies affect different people in different ways, and fairness requires balancing these interests.
- Consumers can explain affordability and access issues.
- Producers can explain costs, output, and incentives.
- Workers can explain wages and working conditions.
- Other groups, such as small businesses and vulnerable communities, may also be affected.
A democratic government should consider all these voices because market policies affect different people in different ways, and fairness requires balancing these interests.
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Before we move on...
1Demand is the quantity consumers are willing and able to buy at different prices. The Law of Demand shows an inverse relationship, that is, as price falls, quantity demanded rises. Demand is influenced by income, prices of substitutes and complements, tastes, seasonality, future expectations, and population.Show solution
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2Supply is the quantity sellers are willing and able to offer at different prices. The Law of Supply shows a direct relationship—as price rises, quantity supplied increases. Supply depends on prices, related goods' prices, the number of sellers, technology, input costs, and other factors such as weather.Show solution
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3Market equilibrium occurs when the quantity demanded equals quantity supplied. Fundamental markets constantly adjust toward a new equilibrium as conditions change—weather, trends, technology, income, and so on, create dynamic pricing conditions.Show solution
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4Government intervenes when markets fail and produce unfair outcomes (unaffordable essentials), under-provide public goods, and enable monopolies. However, excessive government regulations may also have adverse effects.Show solution
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Questions and activities
1An increase in income always leads to a rise in demand for goods. Defend or refute, giving reasons for the same.Show solution
The statement is not always true. An increase in income does not always lead to a rise in demand for all goods.
It is true for many goods because higher income allows people to buy more or better-quality products. But the demand for some goods may not rise much, and for inferior goods it may even fall when income increases, because people may switch to better alternatives.
So, higher income generally increases demand for several goods, but not for every good in the same way.
It is true for many goods because higher income allows people to buy more or better-quality products. But the demand for some goods may not rise much, and for inferior goods it may even fall when income increases, because people may switch to better alternatives.
So, higher income generally increases demand for several goods, but not for every good in the same way.
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2If petrol prices double, what happens toShow solution
The chapter explains that when the price of a substitute good rises, the demand for the other related good rises, and when the price of a complementary good rises, demand for the related good falls.
So if petrol prices double:
- Demand for diesel cars: likely increases because people may shift to a cheaper alternative to petrol cars.
- Demand for electric cars: likely increases because people look for substitutes for petrol-based transport.
- Demand for car accessories: likely falls if fewer people buy or use petrol cars, since accessories are linked to car use.
- Demand for public transport: likely increases because people may choose it as a cheaper alternative.
So if petrol prices double:
- Demand for diesel cars: likely increases because people may shift to a cheaper alternative to petrol cars.
- Demand for electric cars: likely increases because people look for substitutes for petrol-based transport.
- Demand for car accessories: likely falls if fewer people buy or use petrol cars, since accessories are linked to car use.
- Demand for public transport: likely increases because people may choose it as a cheaper alternative.
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3A farmer traditionally irrigates fields manually (labour-intensive). He installs drip irrigation (a technology upgrade) that reduces water use by 40 per cent and increases yield by 30 per cent. How does this affectShow solution
The drip irrigation technology upgrade will:
### a. Cost of production
It will reduce the cost of production because it uses less water and makes farming more efficient.
### b. Willingness to supply at different prices
The farmer will be willing to supply more at each price because production is cheaper and yield is higher, so profit rises.
### c. Overall market supply if many farmers adopt it
If many farmers adopt drip irrigation, market supply will increase. The chapter says improved technology reduces production cost and allows producers to supply more.
### a. Cost of production
It will reduce the cost of production because it uses less water and makes farming more efficient.
### b. Willingness to supply at different prices
The farmer will be willing to supply more at each price because production is cheaper and yield is higher, so profit rises.
### c. Overall market supply if many farmers adopt it
If many farmers adopt drip irrigation, market supply will increase. The chapter says improved technology reduces production cost and allows producers to supply more.
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4During online festival sales, the prices of many products are very low. Use the concept of demand and supply to explain why the sellers sell at such a low price. What happens to the equilibrium when the price is lowered? Does this benefit only consumers or sellers as well? Explain.Show solution
During festival sales, sellers often reduce prices because they expect high demand from many buyers. In some cases, they also want to clear stock quickly, so they accept lower prices to increase sales volume.
When the price is lowered, the quantity demanded rises. If the price goes below the equilibrium price, there may be excess demand if supply cannot match the higher demand immediately. Sellers may still benefit because lower prices can attract more buyers, help them sell more units, reduce unsold stock, and increase total revenue through higher sales volume. So it can benefit both consumers and sellers.
When the price is lowered, the quantity demanded rises. If the price goes below the equilibrium price, there may be excess demand if supply cannot match the higher demand immediately. Sellers may still benefit because lower prices can attract more buyers, help them sell more units, reduce unsold stock, and increase total revenue through higher sales volume. So it can benefit both consumers and sellers.
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5Suppose the government sets a maximum sale price for an essential vaccine below the market-driven price. What is likely to happen? Choose from the options below and elucidate your point.Show solution
If the government sets a maximum sale price below the market price, suppliers are likely to supply less because the price is too low for them. Demand will be higher than supply, so the result is a shortage.
So the correct option is b. Shortage.
So the correct option is b. Shortage.
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6The government levies higher taxes on products such as tobacco and alcohol to promote healthier choices among citizens. Can you find out other goods where price controls have been set in place? What are the reasons for the same?Show solution
Other goods where price controls are set include essential medicines, bus fares in some places, minimum wages for workers, and some essential commodities during emergencies.
The reasons are:
- to make essential goods and services affordable,
- to protect consumers from overcharging,
- to ensure workers receive a fair income,
- and to prevent exploitation during shortages or emergencies.
The reasons are:
- to make essential goods and services affordable,
- to protect consumers from overcharging,
- to ensure workers receive a fair income,
- and to prevent exploitation during shortages or emergencies.
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7Can excessive government regulation hurt markets? Explain with suitable examples.Show solution
Yes, excessive government regulation can hurt markets.
The chapter gives three main problems:
- Price distortions and reduced producer incentives: if prices are fixed too low, producers may produce less, causing shortages.
- Compliance burdens: too many licenses, permits, and rules increase time and cost, especially for small businesses.
- Discourages innovation and entrepreneurship: heavy regulation reduces the incentive to invest in new ideas or better technology.
For example, if farmers cannot earn enough because of low price controls, they may not invest in better seeds or irrigation. So regulation is useful, but too much of it can harm production and business growth.
The chapter gives three main problems:
- Price distortions and reduced producer incentives: if prices are fixed too low, producers may produce less, causing shortages.
- Compliance burdens: too many licenses, permits, and rules increase time and cost, especially for small businesses.
- Discourages innovation and entrepreneurship: heavy regulation reduces the incentive to invest in new ideas or better technology.
For example, if farmers cannot earn enough because of low price controls, they may not invest in better seeds or irrigation. So regulation is useful, but too much of it can harm production and business growth.
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8In the table below, different prices of guava are given.Show solution
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9Visit the nearby vegetable market and try to find answers to the following questions.Show solution
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10Categorise the following combination of goods into substitute goods and complementary goods.
11Fig. 9.8 shows the demand curve DD' and Supply curve SS'. Based on the figure, answer the following questions:
12Draw a market equilibrium graph using the following demand schedule.
12aPlot the demand and supply curve using the above data.
12bIdentify the equilibrium price and quantity.
12cObserve the above data and analyse what happens if the price is set at ₹20 or ₹40.
2bDemand for diesel cars
2cDemand for electric cars
2dDemand for car accessories
2eDemand for public transport
3aHis cost of production
3bHis willingness to supply at different prices
3cThe overall market supply if many farmers adopt this technology
8aThink and write how much guava you will buy at each price.
8bAsk the same question to three of your friends and fill in the table.
8cAlso make a graph for each one of you and one final graph for the total quantity.
9aWho decides the prices of different vegetables in the vegetable market?
9bSometimes the prices of a few vegetables is too high, and sometimes too low. Why is this?
9cThe price of tomatoes is high in the morning and eventually gets lower by the evening. Have you ever noticed this? Comment.
11aWhat does point E represent in this market?
11bWhat is the equilibrium price and equilibrium quantity at point E?
11cPoint A lies on DD'. Point B lies on SS'. What do the points A and B indicate about demand and supply? What does the gap between A and B (both on the upper dashed price line) represent?
11dPoint F lies on DD'. Point C lies on SS'. What do the points F and C indicate about demand and supply? What does the gap between C and F (both on the lower dashed price line) represent?
11eIf the price stays at the lower dashed line, what could happen next in a free market?
34a. Plot the demand and supply curve using the above data.
35b. Identify the equilibrium price and quantity.
36c. Observe the above data and analyse what happens if the price is set at ₹20 or ₹40.
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Sources & Official References
- NCERT Official — ncert.nic.in
- CBSE Academic — cbseacademic.nic.in
- CBSE Official — cbse.gov.in
- National Education Policy 2020 — education.gov.in
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