NCERT Solutions Class 9 Social Science (Understanding Society: India and Beyond, Part I) Chapter 8 – Building Blocks in Economics: The Problem of Choice
Circle of Learning • New NCERT textbook (2026-27) • In-text questions, activities and end-of-chapter questions – complete answers
The Big Questions
Answer
What does economics deal with?
Economics deals with how individuals, enterprises and governments make choices to use limited resources in the best possible way to satisfy unlimited needs and wants. The word comes from the Greek oikonomia (oikos – household, nemein – management), meaning household management. It also studies how consumers, producers, governments and financial institutions interact, how prices are determined and how wealth is distributed.
Answer
What are the key questions in economics?
Because wants are unlimited and resources are limited, scarcity forces choices that give rise to three key questions: what to produce (which goods and services and in what quantities), how to produce (which methods, technologies and mix of factors of production), and for whom to produce (which consumers will be served and who benefits).
Answer
How do different economic systems address these questions?
In a planned economy, a central planning authority of the government decides what, how and for whom to produce, and at what prices. In a market economy, these are decided mainly by demand and supply with private ownership and little government control. A mixed economy combines both: private enterprises and the government both make decisions, with the government regulating markets and providing public goods and welfare.
Opening Questions (In-text)
The chapter opens with questions such as: Would you spend pocket money on snacks or save for shoes? Who should get the first of only five library copies when 20 students want the book? Which crop should a farmer grow? Should an enterprise use more labour or capital? Should the government spend more on highways or hospitals? What do these questions have in common?
Answer
All of them are economic choices made because resources – money, books, land, labour, capital and government funds – are limited while wants are many. Every choice means giving up an alternative (opportunity cost). For example, the library could make students share the books by turns or buy more copies, but buying copies uses money that could be spent elsewhere. Individuals, enterprises and governments all face such choices.
Let's Explore (Needs and Wants)
List three things your parents bought this month. Can you classify them into needs or wants?
Answer
Sample answer:
Item bought | Need or want | Reason |
|---|---|---|
Rice, pulses and vegetables | Need | Food is essential for survival. |
Medicines | Need | Essential for health. |
A new smartphone cover / restaurant meal | Want | Desirable but not essential; life goes on without it. |
Do you think having too many wants may create problems? Why or why not?
Answer
Yes. Since resources such as money are limited, too many wants can lead to overspending, debt and no savings, and essential needs may be neglected. People may feel dissatisfied because wants keep growing (bicycle to motorbike to car). At the level of society, ever-increasing wants put pressure on natural resources and the environment. However, some wants also motivate people to work harder and encourage innovation, so wants must be balanced with resources.
Let's Explore (Opportunity Cost and Time)
Ask your parents about how they make choices for everyday purchases. What is the opportunity cost of making a particular decision?
Answer
Sample answer: My parents first set aside money for essentials such as groceries, school fees, electricity and medicines, then decide on other items and savings. They compare prices, quality and need before buying. For example, when they spent ₹2,000 on a new mixer-grinder, the opportunity cost was the family outing (or the savings) they gave up with that money. The opportunity cost is the value of the next best alternative that is given up.
How do you decide to spend your time? Is time a scarce resource?
Answer
Yes, time is a scarce resource – everyone has only 24 hours a day, and it cannot be stored or increased. I decide by priority: school, study and sleep come first, then helping at home, then play and hobbies. Every use of time has an opportunity cost; for example, spending an extra hour on a mobile game means giving up an hour of study, sport or rest.
Think About It
Should the government allocate more funds to healthcare and education or to defence and space exploration? Why or why not?
Answer
Sample answer: Government funds are limited, so this is a question of choice and opportunity cost. Healthcare and education directly improve people's well-being and productivity, help the poor and build human resources for long-term growth, so they deserve a large share. However, defence is necessary for national security, without which development is not possible, and space exploration brings benefits such as satellites for weather forecasting, communication and disaster warning. A balanced approach is best: give priority to health and education while providing adequate funds for defence and space, based on data about the country's needs.
Let's Explore (Role of Government)
In your opinion, should the government completely stay out of enterprise decisions?
Answer
No. While enterprises should be free to decide what and how to produce, the government must play a role as a referee and more: ensuring fair competition, protecting consumers from adulteration and unfair practices, protecting workers through labour laws, protecting the environment, providing public goods like roads and street lights, and helping weaker sections through welfare programmes. Without this, monopolies, exploitation and pollution could harm society. But too much control can reduce competition and innovation, so a balance is needed.
Can you think of an example where government action helped or harmed an industry or sector?
Answer
Helped: The 1991 economic reforms reduced licences and permits, encouraged private enterprise and opened India to global trade, which helped sectors like telecommunications, information technology and automobiles grow rapidly. Government support for digital payments (UPI) also helped the fintech sector expand.
Harmed (sample): Before 1991, the strict licence system restricted the number of enterprises and competition, so industries such as automobiles had long waiting lists, few models and little innovation – exactly the problem the chapter describes for planned economies.
Don't Miss Out (India's Economic System)
This box explains that after Independence India followed a state-led approach similar to a planned economy, with licences, permits and a large public sector in banking, transport and heavy industries. Facing serious difficulties by 1991, the government introduced reforms that reduced regulations, encouraged private enterprise and opened the economy to global trade and investment, moving India towards a more market-oriented mixed economy. It has no separate question.
Questions and activities
Why do you think people's wants keep changing over time? How does this affect production in an economy? Why cannot all our wants be satisfied?
Answer
Why wants change: Rising incomes, new technology and products, advertising, changing fashions, age and lifestyle, and influence of friends and media make people want new and better things – for example, from a bicycle to a motorbike to a car.
Effect on production: Producers must keep studying market trends and changing what and how much they produce; new industries and products emerge (such as smartphones) while demand for older products falls. This encourages innovation but also requires resources to be shifted.
Why all wants cannot be satisfied: Wants are unlimited and keep multiplying, while resources – land, labour, capital, technology, money and time – are limited and have alternative uses. Choosing one option means giving up another, so every want can never be met.
'Human wants are unlimited and keep changing'. How do you think this constant desire for more creates pressure on the environment? Can the fulfilment of wants and the extraction of resources be balanced?
Answer
Pressure on the environment: Producing more goods requires more extraction of minerals, water, forests and fossil fuels, leading to deforestation, depletion of groundwater, pollution and climate change. Frequent replacement of gadgets and clothes creates waste, including e-waste and plastic. Water-intensive crops like sugarcane and paddy in dry areas deplete water and harm soil.
Balance is possible: Yes, through sustainable choices – distinguishing needs from wants, reducing, reusing and recycling, using renewable energy, growing crops suited to the region (like millets and pulses, which save water and improve soil health), efficient technology and government policies that consider long-term opportunity costs. The goal is to meet present needs without harming the ability of future generations to meet theirs.
Can you think of a resource in your region that is scarce but used wastefully? How could it be managed better?
Answer
Sample answer: Water is scarce in our region, especially in summer, but it is wasted through leaking taps and pipes, washing vehicles with running hoses, over-irrigation by flooding fields, and growing water-intensive crops.
Better management: rainwater harvesting in homes and schools; repairing leaks; drip and sprinkler irrigation; choosing less water-intensive crops like millets and pulses; recharging groundwater through check dams and ponds; metering and fair pricing of water; and awareness campaigns.
Which economic system—market, planned, or mixed—do you think gives people the most freedom? Which economic system is best suited for promoting innovation? Why?
Answer
Most freedom: A market economy gives people the most economic freedom, because individuals and private companies own resources and freely decide what to produce, buy and sell, with little government intervention.
Innovation: A market economy (and a mixed economy with a strong private sector) is best for innovation. Many producers compete, which encourages better quality, lower prices and new products. In a planned economy, strict permits and limited competition leave little motivation to innovate. A mixed economy can combine market-driven innovation with government support for research and fair competition.
Critically examine why pure economic systems rarely exist in reality. Assess the limitations of such systems and justify why a mixed economy is often considered a more practical and effective approach in real-world contexts.
Answer
Limitations of a pure planned economy: Government controls most resources and decisions, so there is little competition and motivation to improve quality or innovate; enterprises follow targets rather than people's demand, which can cause shortages or waste; and strict licences restrict enterprise (former Soviet Union, North Korea, Cuba).
Limitations of a pure market economy: Without government, there would be no public goods like roads, street lights, police or basic education (private firms cannot earn profit from them); the poor may be neglected; monopolies, unfair practices, consumer cheating and pollution may grow. That is why even the USA and Singapore have significant government involvement.
Why mixed economy is practical: It allows private ownership, competition and innovation while the government sets fair competition rules, protects consumers, ensures transparency, provides public goods and runs welfare programmes. India's shift after 1991 – keeping an important government role while encouraging private enterprise – shows this. Hence almost all real economies are mixed.
A student has ₹100 and must choose between buying a notebook or saving the money for buying a tennis racket later. Which economic concept best explains this situation?
Answer
a. Demand b. Opportunity cost c. Production d. Inflation
Answer: (b) Opportunity cost. The ₹100 can be used for only one purpose. If the student buys the notebook, the opportunity cost is the saving towards the tennis racket, and vice versa.
How does understanding opportunity cost improve the quality of economic decision-making?
Answer
Opportunity cost makes decision-makers compare what they gain with what they give up, instead of looking only at the immediate benefit. This helps them choose the alternative with the greatest overall value. For example, a farmer choosing sugarcane must consider the water and soil health given up; a government building a highway must consider the hospitals it could have built. It encourages efficient use of scarce resources, careful planning and attention to long-term consequences.
Can effective economic decisions be made without reliable data? Support your answer with an example.
Answer
No. Good decisions rely on data and analysis, not guesswork. For example, the Economic Survey of India, prepared by the Ministry of Finance and presented in Parliament before the Union Budget, reviews data on agriculture, industry, services, employment, inflation, education and health; it acts as a blueprint for the Budget. Without reliable data, the government might spend on the wrong sectors. Similarly, a company that does not study market demand may produce goods that do not sell, and a family that does not track income and spending may run short for essentials.
Analyse how a country's present economic choices can shape its long-term future. Why is it important to consider future consequences while making economic decisions today?
(i) Investment today in education, health and research builds skilled human resources and drives future growth and innovation.
(ii) Building infrastructure like roads, power and digital networks supports industry and jobs for decades.
Answer
(iii) Choices about natural resources matter: overusing groundwater for water-intensive crops brings short-term profit but can leave future farmers without water, while millets and pulses support sustainable agriculture.
(iv) Policy choices change the path of the economy – India's 1991 reforms shaped its growth in the following decades.
Why consider the future: Resources used today are not available tomorrow, and some damage (like soil degradation and pollution) is hard to reverse. Considering opportunity costs over time balances short-term gains with long-term sustainability and the well-being of future generations.
Identify a news article about a product or commodity (such as vegetables, fruits, fuel, or electronics) where producers or companies are deciding how much to produce or supply. Write 2–3 sentences explaining the example and why the production decision was made.
Answer
Sample answer: A newspaper reported that many farmers in a region reduced the area under onion this season and shifted to other crops. Onion prices had fallen sharply last year due to excess supply, so farmers expected low returns and decided to grow crops with better prices. This shows producers deciding what and how much to produce based on expected market demand, prices and opportunity cost. (Students should use a real article and mention the newspaper and date.)
Extra Important Questions
Multiple Choice Questions
The word 'economics' comes from the Greek word 'oikonomia', meaning:
Answer
(a) Trade management (b) Household management (c) State management (d) Money management
Answer: (b) Household management
The value of the next best alternative given up when a choice is made is called:
Answer
(a) Price (b) Profit (c) Opportunity cost (d) Scarcity
Answer: (c) Opportunity cost
Which of the following is an example of a planned economy given in the chapter?
Answer
(a) Japan (b) Cuba (c) Hong Kong (d) Germany
Answer: (b) Cuba
4. Production that uses more machines and fewer workers is called
(a) Labour-intensive (b) Capital-intensive (c) Land-intensive (d) Market-intensive
Answer: (b) Capital-intensive
Which of these is a public good?
Answer
(a) A private car (b) A mobile phone (c) Street lights (d) A restaurant meal
Answer: (c) Street lights
6. The Economic Survey of India is prepared by the
(a) Reserve Bank of India (b) Ministry of Finance (c) Election Commission (d) Planning Commission
Answer: (b) Ministry of Finance
Short Answer Questions
Using the farmer's barley–wheat table, explain the opportunity cost of producing more barley.
Answer
Moving from A (0 barley, 100 wheat) to B (25, 90) costs 10 kg of wheat; B to C (50, 70) costs 20 kg; C to D (75, 40) costs 30 kg; and D to E (100, 0) costs 40 kg. So each extra 25 kg of barley requires giving up more wheat, showing that the opportunity cost of barley rises as more of it is produced. This is why the PPC slopes downward.
What is a Production Possibility Curve (PPC)? What do points on it show?
Answer
A PPC is a curve showing the different combinations of two goods that can be produced using all available resources. It slopes downward, showing the trade-off between the goods. All points on the PPC show the maximum output possible through efficient use of resources without wastage, which helps in planning and decision-making.
How does a producer decide 'for whom to produce'? Explain with the example of shoes.
Answer
Producers study consumers' needs, income, tastes and demand. For example, school shoes are simple, durable and affordable for students; office-wear shoes are formal and often of leather for professionals; sports shoes use special rubber soles and lightweight materials for athletes; and casual shoes are comfortable and affordable for daily use.
What factors influence a garment manufacturer's choice between labour-intensive and capital-intensive methods?
Answer
The cost of machines and of labour, the availability of labour and technology, the nature of the product (customised designer clothes need skilled labour while mass-produced garments suit machines), and government laws and regulations such as labour laws or incentives for machinery.
Long Answer Questions
Compare planned, market and mixed economies.
Answer
Basis | Planned economy | Market economy | Mixed economy |
|---|---|---|---|
Who decides | Central planning authority of the government | Forces of demand and supply | Both private sector and government |
Ownership | Government owns most resources and sectors | Individuals and private companies | Private ownership with large public sector companies |
Role of government | Controls production and prices through permits and licences | Referee: ensures safety, law and order; provides public goods and infrastructure | Regulates: fair competition rules, consumer protection, transparency, public goods, welfare |
Competition and innovation | Little competition and innovation | High competition; better quality, lower prices, innovation | Competition with regulation |
Examples | Former Soviet Union, North Korea, Cuba | USA, Japan, Hong Kong | India (post-1991), China (post-1978), Germany, Sweden |
"Scarcity is the root of all economic problems." Explain with reference to the three key questions of economics.
Answer
(i) Human wants are unlimited, but resources – land, labour, capital and technology – are limited and have alternative uses (steel can be used for medical equipment, aircraft or refrigerators). This mismatch creates scarcity, which forces choices.
(ii) What to produce: Society must decide which goods and in what quantities, e.g., water-intensive sugarcane and paddy or water-saving millets and pulses, weighing short-term profit against long-term sustainability.
(iii) How to produce: Producers choose between labour-intensive and capital-intensive methods depending on costs, technology, the product and laws.
(iv) For whom to produce: Producers decide which consumers to serve based on needs, incomes and tastes, as with different types of shoes.
(v) Every choice carries an opportunity cost. If resources were unlimited, no choices would be needed, so scarcity is the basic economic problem that economic systems try to solve.