The answer links changing wants to the central economic problem of scarcity and choice.
Wants change with age, income, technology, advertising, fashion, social conditions and newly available products. Producers respond by changing what they make, how much they make and the resources and methods they use. All wants cannot be satisfied because land, labour, time, capital and natural resources are limited and have alternative uses. Choosing one use therefore sacrifices another, creating an opportunity cost.
The response applies scarcity and long-term choice to environmental resources.
Rising demand can accelerate mining, logging, water withdrawal, energy use and waste, causing depletion, pollution, habitat loss and climate stress. A balance is possible if prices and rules reflect environmental costs, resources are extracted within regenerative limits, durable goods are repaired and reused, waste is recycled and cleaner technologies are adopted. Consumers must also distinguish important needs from wasteful consumption. The aim is not to end all production but to satisfy wants without destroying the resource base needed by future generations.
This is a model regional example; students may substitute another locally relevant resource.
A common example is freshwater. It is scarce in many Indian towns, yet leaking pipes, overflowing tanks, inefficient irrigation and unnecessary washing waste it. Metering large users, repairing leaks, harvesting rainwater, reusing treated greywater and wastewater, using drip irrigation and informing users about local supply can reduce waste. Groundwater withdrawal should also be monitored so that use does not continually exceed recharge.
The response compares freedom and innovation while acknowledging trade-offs described in the chapter.
A market system generally gives consumers and private producers the widest direct freedom to choose, and competition and the possibility of profit can encourage innovation. But freedom is unequal when income or market power is highly unequal, and markets may neglect public goods or environmental costs. A well-designed mixed economy can therefore promote innovation effectively while protecting competition, funding basic research and public services, and regulating harmful conduct. The conclusion depends on institutions, not only the system’s label.
The answer evaluates the limitations of both ideal types and the logic of combining them.
A pure market economy can allocate many goods responsively but may produce inequality, monopolies, under-provision of public goods and unpriced environmental harm. A fully planned economy can pursue social priorities and coordinate resources, but concentrated decision-making may lack local information, consumer choice and incentives to improve. Real societies need both private initiative and collective provision. A mixed economy uses markets for decentralised choice and innovation while government supplies public goods, protects consumers, supports vulnerable groups, corrects market failures and regulates competition. Its success still depends on capable, transparent government and fair rules.
- a. Demand
- b. Opportunity cost
- c. Production
- d. Inflation
Choosing the notebook means giving up the benefit of saving ₹100 toward the racket, while saving means giving up the notebook now. The next-best forgone alternative is the opportunity cost.
Opportunity cost.
The response explains opportunity cost as a comparative decision tool.
Opportunity cost makes a decision-maker compare a choice with the best alternative that must be given up, including costs not shown by the money price. This discourages treating time or public resources as free and helps compare options according to their real benefits. A student, firm or government can then direct scarce resources toward the use with the greatest expected value rather than considering one option in isolation.
The model example shows how evidence affects scarcity and allocation decisions.
Some urgent choices must be made with incomplete information, but reliable data usually makes economic decisions far more effective. Without it, needs, costs and opportunity costs may be estimated badly and resources misallocated. For example, a city deciding how much water to supply needs sound data on population, reservoir levels, leakage and seasonal demand. Otherwise it may overinvest in an unnecessary project or fail to prevent a shortage. Uncertainty should therefore be acknowledged and decisions updated as better evidence arrives.
The answer applies scarcity, investment and opportunity cost across time.
Present choices determine the infrastructure, skills, technology, institutions, debt and environmental conditions inherited by future citizens. Investment in education, health, research and resilient infrastructure can raise later productivity and opportunity. By contrast, exhausting groundwater, polluting ecosystems or borrowing for wasteful consumption can create lasting costs. Because resources used today cannot simultaneously serve another purpose and some damage is difficult to reverse, decision-makers should compare long-term social benefits and opportunity costs rather than focus only on immediate gains.