NCERT Solutions for Class 9th Social Science Chapter 8 End-of-chapter exercise — Questions and activities

Three questions, so three parts.

(a) Why wants keep changing. The chapter's own example carries the answer: “people may want to upgrade from a bicycle to a motorbike and then to a car.” Notice that the bicycle owner did not stop wanting because the bicycle worked. Wants change because:

• Satisfying one want reveals the next. Once travel is solved by a bicycle, the new want is faster and more comfortable travel.
• Income changes. As families earn more, items that were out of reach move into the list of possibilities.
• New goods appear. Nobody wanted a mobile phone before it existed. Producers “study market trends and new innovations”, and each new product creates a want that did not exist.
• Age and circumstance change. A child wants toys, a student wants books and a phone, an adult wants a house. The same person's list changes through life.
• What others have matters. Seeing a neighbour's purchase turns a possibility into a want.

(b) How this affects production. Changing wants keep pushing the ‘what to produce’ question open, so production never settles.

The chapter puts the constructive side plainly: many producers offering similar products “encourages better quality, lower prices, and innovation in production of goods and services.” The costly side is on the same page — resources shifted to make one thing are resources taken away from another, so changing wants continually change the opportunity cost of everything an economy produces.

(c) Why all wants cannot be satisfied. Because of the two facts the chapter opens with, taken together:

Every want is finally met out of a resource, and the chapter says resources are of two kinds — natural, like water and coal, and human-made, like capital and technology. Since human-made resources are themselves built from natural ones, unlimited wants press ultimately on nature.

How the pressure builds, step by step:

The chapter's own agricultural example shows this exactly. Growing water-intensive crops such as sugarcane and paddy uses up water and does not improve soil health; growing millets and pulses “saves water, improves soil health, and promotes sustainable agriculture.” The forgone water and soil are a genuine cost of meeting the demand for sugar — an environmental opportunity cost, even though it appears on no bill. The upgrade example works the same way: a bicycle uses almost nothing to run, a motorbike and a car consume fuel and metal, so the same journey made in a more wanted way draws far more from nature.

Can the two be balanced? Yes — but only by counting the environmental cost as a real cost. The chapter gives the method rather than a slogan: “This type of decision reflects the trade-off between short-term economic gains and long-term sustainability by accounting for the opportunity costs of various alternatives.” Balance therefore means:

• Enter the resource on the cost side. If the water used and the soil damaged are counted when comparing crops, the comparison itself changes, and so does the choice.
• Choose the technique, not only the product. The ‘how to produce’ question can be answered in ways that use less water, less fuel and less material for the same output.
• Separate needs from wants when resources are tight. Needs are limited and repeat; it is the unlimited wants that expand without end.
• Reuse and share rather than replace. The library example in the chapter applies here too — the same five copies serving twenty readers is a resource used well.

This asks about your own region, so the answer must name a real local resource — but the reasoning it needs is the chapter's.

Method. Build the answer in four steps:

1. Name the resource and say why it is scarce there — limited in quantity and with alternative uses competing for it.
2. Show the waste with something you can see: a leak, a practice, an amount.
3. State the opportunity cost of the waste — what the wasted resource would otherwise have done, and for whom.
4. Propose management that fits the cause, and be honest about what each measure costs.

Sample answer: In my area the scarce resource is groundwater. Our borewell has had to be deepened twice in six years, and in April and May the supply falls for an hour or two each day — clear signs that we are taking out more than the rain puts back. Yet it is used wastefully: taps run while utensils are scrubbed, the street tap leaks all day, several households wash two-wheelers with a running hose, and the fields near us are under a water-hungry crop even in a low-rainfall year.

The opportunity cost of that waste is not abstract. Every litre lost from the leaking street tap is a litre unavailable to the households at the end of the line, whose supply fails first; and every extra metre the borewell must be deepened is money the family cannot spend on anything else. Because groundwater is shared, one household's waste raises the cost for everyone drawing from the same aquifer.

If your region's scarce resource is different, the same four steps apply — firewood and forest cover in a hill area, grazing land in a dry district, clean river water near a town, or space and parking in a city. Name it, show the waste, price the opportunity cost, then manage.

Two questions, and they do not have the same answer once “freedom” is examined properly.

(a) Freedom. On the chapter's description, the market economy gives the widest freedom of a particular kind. Ownership of factories, shops, land and other resources “largely rests with individuals and private companies”; what, how and how much to produce is decided by demand and supply “with little government intervention”; and the government “does not control prices or production”. So producers are free to enter any business and consumers are free to choose among many producers offering similar products.

But the word carries a second meaning, and a full answer must say so. Freedom to choose is worth little to someone who cannot afford any of the choices. A market answers ‘for whom to produce’ by purchasing power, so a person with very low income is free in law and constrained in fact. This is why the chapter lists welfare programmes and public goods on the government side of Fig. 8.8: parks, roads, police services, street lights and basic education are available to all “without anyone being excluded”. A mixed economy keeps the market's freedom of choice and adds the floor that makes the choice usable, which is why many would argue it delivers the more meaningful freedom overall.

The planned economy is the most restrictive on the chapter's own account: the central authority decides what is produced, how, for whom, and at what prices, and strict permits and licenses prevent a large number of enterprises from operating at all.

(b) Innovation. Here the chapter is direct. In a market economy “many producers offer similar products, which encourages better quality, lower prices, and innovation in production of goods and services.” In a planned economy, restricted competition means “there is little motivation among enterprises to improve quality or innovate.”

So the mechanism, not the label, is what produces innovation: competition creates the pressure, and private ownership lets the innovator keep the reward. A mixed economy preserves that mechanism — Fig. 8.8 places profit-making businesses, innovation and competition on the market side — while the government supplies the fair competition rules that keep the competition alive, funds research and education, and builds the infrastructure that innovation depends on.

Pure systems are rare because each of them, taken to its logical end, fails at something an economy cannot do without — and the failures are opposite ones. The chapter states the outcome itself: “In reality, most economies have features of mixed economic systems”, and “almost all economies are mixed.”

Limitations of a pure planned economy, from the chapter's own account:

• Strict permits and licenses “prevent a large number of enterprises to operate in the market”, so competition is restricted.
• With no competition, “there is little motivation among enterprises to improve quality or innovate”.
• Enterprises “follow the central authority's targets rather than market demand” — so what is produced can drift away from what people actually need.
• One authority must judge the wants and resources of an entire country, which requires more information than any single body can gather accurately.

Limitations of a pure market economy, read from what the chapter says a government must supply:

• Public goods go unsupplied. Parks, roads, police services, street lights and basic education are available to all “without anyone being excluded” — precisely why no private producer can charge for them and none will provide them.
• ‘For whom to produce’ is answered by purchasing power, so people with low incomes are served last. Welfare programmes appear on the government side of Fig. 8.8 for this reason.
• Competition does not protect itself. Fair competition rules and consumer protection have to be enforced by someone outside the market.
• Transparency is a condition for good decisions, and the chapter's insistence on data and analysis rather than guesswork depends on information being reliably published.

Why the mixed system is the practical answer. Because the two lists of limitations are complements: what the market cannot supply is close to what the State can, and what the State does badly is close to what competition does well. Fig. 8.8 divides them explicitly.

India is the chapter's illustration of a country arriving at that position by experience rather than by design. After Independence it followed a more state-led approach, with licenses, permits and public-sector dominance in banking, transport and heavy industries; “by 1991 the country faced serious economic difficulties”; the reforms then reduced excessive regulations, encouraged private enterprise, opened the economy to global trade and investment and increased competition, shifting India “towards a more market-oriented system while still retaining an important role for the government.”

(b) Opportunity cost.

The chapter's definition fits the situation word for word: “When one alternative is chosen, the other options are given up. The value of what is given up is known as the opportunity cost.” If the student buys the notebook, the opportunity cost is the racket (or rather, being ₹100 closer to it). If the student saves, the opportunity cost is the notebook.

Why the other three are wrong:

Because it changes what counts as the cost of a decision. Without it, a decision is judged by what it gains; with it, the gain is set against the best alternative that was given up. That single shift makes a comparison possible where before there was only an attraction.

Four things it does, each visible in the chapter:

• It makes hidden costs visible. The chapter's sharpest example: “the opportunity cost of producing sugarcane is the forgone gains from saved water and improved soil health.” Those losses appear on no bill, so a farmer counting only profit would never see them. Opportunity cost puts them on the same page as the profit.
• It converts vague preference into arithmetic. The farmer's PPC turns “grow more barley” into a number for every step:

Read the last column and the decision almost makes itself. Moving from A to B is cheap — 25 kg of barley for only 10 kg of wheat. Moving from D to E is expensive — the same 25 kg of barley now costs 40 kg of wheat. A farmer who knows this will expand barley only while the barley gained is worth more than the wheat lost, and will stop at the step where it is not. Opportunity cost tells you not only what to choose but where to stop.

• It exposes trade-offs across time. The chapter frames the crop decision as “the trade-off between short-term economic gains and long-term sustainability”. A decision that looks good this season may be costly over ten, and only opportunity cost brings the later loss into today's comparison.
• It disciplines public spending. Highways or hospitals, healthcare and education or defence and space — a government cannot claim any of these is free, because each is funded from the same limited tax revenue. Naming what is given up forces the choice to be argued rather than assumed.

No. The chapter's position is explicit — “good decisions rely on data and analysis, not guesswork.” The reason is structural: an economic decision is a comparison of alternatives and their opportunity costs, and you cannot compare what you have not measured.

Example from the chapter — the farmer's crop choice. To decide between sugarcane and millets, a farmer needs the yield each crop gives on that soil, the water each needs against the rainfall the region actually receives, the price each fetched last season, and the demand expected this year. With those figures the opportunity cost of each option can be worked out and compared. Without them the farmer is choosing on rumour — and if the guess is wrong, the land, water, labour and a whole season are spent on the wrong crop and cannot be recovered.

Example at national scale — the Economic Survey. The chapter describes the Economic Survey of India as an annual document of the Ministry of Finance, presented in Parliament before the Union Budget, which reviews the past year's economic performance and analyses agriculture, industry, services, employment, inflation, education, health and infrastructure, and discusses future challenges and opportunities. It “acts as a blueprint for the upcoming Union Budget by providing crucial insights for policymakers”. That is data doing precisely this job: a government deciding between highways and hospitals needs to know where health facilities are thin and where roads are missing before it can say which rupee is better spent.

Examples from households and firms. Families allocate money across essential items, non-essential items and savings — which needs a record of what actually comes in and goes out. Enterprises “study market trends and new innovations to better serve customers and maximise profits”, and economists use data from government reports and companies' financial statements, whose analysis “helps to understand the potential risks and opportunities.”

Because most economic choices commit resources that cannot be recalled, today's decision fixes part of the range of choices available tomorrow. The chapter's closing paragraph makes this the point of the whole chapter: “Understanding these ideas helps us appreciate how everyday decisions, public policies, and economic systems together shape the production, distribution, and use of resources in an economy.”

Three channels through which the present shapes the future:

Why future consequences must be counted today. Chiefly because the opportunity cost of a decision is often paid later than the benefit.

Three further reasons follow from that. Some effects cannot be undone — an exhausted aquifer or a degraded soil cannot be repurchased at any price, so the mistake is permanent in a way an ordinary bad purchase is not. Decisions compound — a generation educated well produces the technology and the enterprises of the next generation, and a generation left unschooled does not. And the people who bear the cost may not be the people making the choice, which is why the chapter puts the phrase “long-term sustainability” beside “short-term economic gains” instead of treating profit as the whole of the calculation.

This is a newspaper activity, so the article must be your own — but the 2–3 sentences must do a specific job, and that is what earns the marks.

Method.

1. Find the right kind of report. Look in the business or agriculture pages for an item saying that output, acreage, supply or arrivals are going up or down — for example onion or tomato arrivals in a mandi, a sugar mill's crushing plan, a car or phone company's production target, or a change in fuel supply.
2. Note four things before you write: the product, who is deciding (a farmer, a mill, a company), the direction of the change, and the reason the article gives.
3. Write three sentences in this order — (i) what the article reports, (ii) the reason the producers gave, (iii) which of the chapter's key questions this is, and what is being given up.

Sample answer (replace with your own article, and give the newspaper's name and date):