01 · Explore
Choices begin with what matters and what is available
Needs and preferences depend on context.
- Need
- Something essential for well-being, such as food, safe water or shelter.
- Want
- A desired good or experience that may go beyond a basic need.
- Economics
- Study of how people and societies make choices about resources, production and distribution.
One budget serves several purposes
- Model
- A simplified choice; there can be many uses and combinations, not just two mutually exclusive purchases.
A household might balance food, medicine, school supplies, recreation and savings. A phone can be a luxury upgrade for one person and an essential access tool for another: discuss its purpose, not only the object’s name.
Wants can change and compete for limited resources. Economics studies the trade-offs, institutions and consequences of choices, rather than declaring every personal preference wrong.
Pause & Try
Think it through first. Writing and checking your answer is free with an account.
Question
Why might the same item be a need in one situation and a want in another?
Sign in to see the answer
Write your own answer and compare it with ours. It’s free.
Sign inNew here? Sign up freeNCERT reference: chapter PDF pages 1, 2, 11, 12.
02 · Explore
Scarcity means resources cannot meet every competing use
A useful resource often has several possible jobs.
- Scarcity
- Resources being limited relative to competing needs and wants.
- Resource
- Something used to produce goods or services.
- Alternative use
- Another possible purpose for the same resource.
Money, time, land, water, skills and machinery are limited in a particular decision. Scarcity is different from total absence: a library may have books but not enough copies for everyone at once.
Steel can become medical equipment, aircraft parts or appliances. Allocating it to one purpose can limit another. Sharing, changing schedules or increasing future capacity can help, but none removes every trade-off.
Pause & Try
Think it through first. Writing and checking your answer is free with an account.
Question
Why does a library with five books for twenty readers still face scarcity?
Sign in to see the answer
Write your own answer and compare it with ours. It’s free.
Sign inNew here? Sign up freeNCERT reference: chapter PDF pages 1, 2, 3, 6.
03 · Explore
The real sacrifice is the next-best alternative
Do not add together every rejected option.
- Opportunity cost
- The value of the best alternative forgone when making a choice.
- Trade-off
- Giving up some of one thing to obtain more of another.
Choosing one route gives up the best other route
- Model
- An original time-choice example. Opportunity cost is not the sum of all possible activities.
If your best alternative to an hour of gaming is reading a book, that forgone reading opportunity is the opportunity cost. It need not be a cash payment. Other rejected activities are not all added together.
For governments and businesses, choices can have future and environmental costs too. Compare feasible alternatives under stated conditions, rather than guessing that the expensive option must be best.
Pause & Try
Think it through first. Writing and checking your answer is free with an account.
Question
Your preferred alternative to buying a snack is saving for a notebook. What is the opportunity cost of the snack?
Sign in to see the answer
Write your own answer and compare it with ours. It’s free.
Sign inNew here? Sign up freeNCERT reference: chapter PDF pages 2, 3, 4, 11, 12.
04 · Explore
A production frontier shows the available trade-off
Keep resources and technology fixed for this model.
- Production Possibility Curve
- The maximum feasible combinations of two outputs under stated resources and technology.
- Efficient production
- Using available resources without avoidable wasted productive capacity in the model.
The book’s crop frontier
Wheat (kg)
Barley (kg)
- Frontier · Fixed resources and technology; illustrative book schedule.
- 1. Inside: less output than the frontier · (25, 40)
- 2. Outside: not feasible under these assumptions · (75, 90)
Assumptions: Connect the given combinations as a classroom approximation. Do not assume the unlisted points are measured farm yields.
Read the plotted values
Frontier
| Barley (kg) | Wheat (kg) |
|---|---|
| 0 | 100 |
| 25 | 90 |
| 50 | 70 |
| 75 | 40 |
| 100 | 0 |
Connect the given combinations as a classroom approximation. Do not assume the unlisted points are measured farm yields.
The book’s farmer can produce combinations of barley and wheat: (0,100), (25,90), (50,70), (75,40), (100,0), in kilograms. The curve slopes down because more barley requires giving up wheat.
These are illustrative possibilities, not crop-yield measurements for a real farm. A point inside can reflect unused capacity; a point outside is unattainable under the stated current conditions. Being efficient does not itself prove a fair distribution.
| Barley kg | Wheat kg |
|---|---|
| 0 | 100 |
| 25 | 90 |
| 50 | 70 |
| 75 | 40 |
| 100 | 0 |
Pause & Try
Think it through first. Writing and checking your answer is free with an account.
Question
At 50 kg barley in the table, what is the frontier wheat output?
Sign in to see the answer
Write your own answer and compare it with ours. It’s free.
Sign inNew here? Sign up freeNCERT reference: chapter PDF pages 2, 3.
05 · Explore
Equal output increases can have unequal costs
Read the changes, not only the endpoints.
- Marginal trade-off
- What is forgone for an additional increment of output.
What each extra 25 kg barley costs
Wheat forgone (kg)
Step (1 A→B; 2 B→C; 3 C→D; 4 D→E)
- Increment cost · Differences calculated from the book table.
Assumptions: These are costs of equal 25 kg barley increments, not wheat output levels.
Read the plotted values
Increment cost
| Step (1 A→B; 2 B→C; 3 C→D; 4 D→E) | Wheat forgone (kg) |
|---|---|
| 1 | 10 |
| 2 | 20 |
| 3 | 30 |
| 4 | 40 |
These are costs of equal 25 kg barley increments, not wheat output levels.
Each additional 25 kg barley in the book schedule costs 10, then 20, then 30, then 40 kg wheat. Resources suitable for wheat may not be equally suitable for barley, so successive switches can sacrifice more wheat.
From B (25,90) to C (50,70), barley rises by 25 and wheat falls by 20. The cost for that increment is 20 kg wheat, or 0.8 kg wheat per additional kg barley, averaged over this interval.
Read one move
Δbarley = 50 − 25 = 25; wheat forgone = 90 − 70 = 20
Compare adjacent combinations under the same fixed-resource model.
Pause & Try
Think it through first. Writing and checking your answer is free with an account.
Question
From C to D, how much wheat is forgone for 25 kg extra barley?
Sign in to see the answer
Write your own answer and compare it with ours. It’s free.
Sign inNew here? Sign up freeNCERT reference: chapter PDF pages 3, 4.
06 · Explore
Households, producers and governments interact
Better decisions need reliable evidence.
- Economic entity
- A participant such as a household, enterprise, government or financial institution.
- Data
- Recorded observations or measurements used in analysis.
- Economic Survey
- The government’s annual review and analysis of the economy, distinct from the Budget.
Participants exchange resources and services
- Model
- A small actor network. Lines represent interactions, not fixed cash amounts or every role.
Households consume and supply work; enterprises produce; governments collect revenue and provide services; financial institutions connect saving and finance. The relationships are more complex than one isolated buyer and seller.
Economists use surveys, accounts and other data to study choices and outcomes. Check the date, units, sample and limitations. India’s Economic Survey analyses developments; the Budget sets out proposed receipts and expenditure.
Pause & Try
Think it through first. Writing and checking your answer is free with an account.
Question
Why should a report’s date and units be checked before using its number?
Sign in to see the answer
Write your own answer and compare it with ours. It’s free.
Sign inNew here? Sign up freeNCERT reference: chapter PDF pages 4, 5.