Q.Why is production possibility curve generally concave to the origin ? Give a reason.
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Imagine you have only 4 hours to study after school. You can spend them all on Physics, all on Economics, or split them between the two. If you study only Physics, you might master 4 chapters. If only Economics, you could finish 6 chapters. But if you split your time, you get some of both — maybe 3 Physics chapters and 3 Economics chapters.
That trade-off is the core idea behind the Production Possibility Frontier (PPF).
What the PPF actually is
The PPF is a curve that shows all the maximum combinations of two goods (or services) an economy can produce when it uses all its resources fully and efficiently, given the current technology.
Think of a country that produces only two things: wheat and cloth. It has a fixed amount of land, labour, and machines. If it puts everything into wheat, it gets, say, 100 tonnes of wheat and zero cloth. If it puts everything into cloth, it gets 50 metres of cloth and zero wheat. In between, there are many possible combinations — 80 tonnes of wheat and 20 metres of cloth, or 50 tonnes of wheat and 35 metres of cloth, and so on.
Plot these points on a graph: wheat on the x-axis, cloth on the y-axis. The curve that connects them is the PPF.
The PPF is always drawn as a downward-sloping curve that is concave to the origin (bowed outward). The downward slope is obvious — to get more of one good, you must give up some of the other. The outward bow shape comes from the law of increasing opportunity cost, which we'll see in a moment.
The key ideas the PPF teaches
1. Scarcity and choice
The PPF is a picture of scarcity. You cannot have everything — the economy cannot produce a point outside the curve (like 100 tonnes of wheat and 50 metres of cloth) because resources are limited. Every point on the curve is efficient; every point inside the curve (like 40 tonnes of wheat and 10 metres of cloth) means resources are lying idle or being used wastefully.
2. Opportunity cost
Moving from one point on the PPF to another means producing more of one good and less of the other. The amount of the good you give up is the opportunity cost of getting more of the other good.
Here's where the shape matters. Because resources are not equally suited to producing both goods, the opportunity cost increases as you produce more of one good. Early on, you shift land that is great for wheat into cloth production — you lose only a little wheat for a lot of cloth. But as you keep shifting, you start pulling land that is excellent for wheat but terrible for cloth. Now you lose a lot of wheat for just a little extra cloth. This is the law of increasing opportunity cost, and it is why the PPF is bowed outward (concave to the origin).
Marginal Opportunity Cost (MOC) = Units of good gainedUnits of good given up
For example, if moving from combination A to B means losing 10 tonnes of wheat to gain 5 metres of cloth, the MOC of 1 metre of cloth is 510=2 tonnes of wheat.
3. Efficiency and inefficiency
- Points on the PPF: The economy is using all resources fully and efficiently. You cannot produce more of one good without producing less of the other.
- Points inside the PPF: Resources are underutilised — maybe there is unemployment, or factories are running below capacity. You can produce more of both goods without sacrificing anything.
- Points outside the PPF: Unattainable with current resources and technology.
4. Economic growth
If the economy gets more resources (more labour, more capital) or better technology, the entire PPF shifts outward. Now combinations that were previously impossible become possible. This is what we call economic growth.
Why the PPF matters (NCERT's emphasis)
The NCERT textbook uses the PPF to introduce three fundamental economic problems:
- What to produce? — Which point on the PPF should we choose?
- How to produce? — Which production method (labour-intensive or capital-intensive) keeps us on the PPF? …
The PPC is concave to the origin because resources are not equally efficient at producing every good. …
The Production Possibility Curve (PPC) is concave to the origin because the marginal opportunity cost of producing an additional unit of one good (in terms of the other good given up) keeps rising as more of that good is produced.
Resources (factors of production) are not perfectly substitutable between different uses — some resources are better suited to producing good X and others to producing good Y. As an economy shifts resources from producing good Y to producing more of good X, it must progressively draw in resources that are less and less suited to producing X. This means each additional unit of X requires giving up increasing amounts of Y — i.e. the Marginal Rate of Transformation (MRT) increases. This increasing …
Showing the 12 most recent of 17 on this concept.
- CBSE 2026Set ANNUAL1 markMCQQ.The gain forgone from the second best activity is:(a) Normal Profit(b) Super-Normal Profit(c) Opportunity cost(d) The shut-down point
›Reveal solutionSolution
The gain forgone from the second-best activity is the opportunity cost — option (c).
Opportunity cost is the value (gain) of the next-best (second-best) alternative that is sacrificed when a choice is made. So the gain forgone from the second-best activity is ex …
- CBSE 2025Set ANNUAL1 markQ.Write any one central problem of an economy.
›Reveal solutionSolution
One central problem is 'what to produce' — deciding which goods and how much of each to produce with scarce resources.
In the RBSE/CBSE Class-12 introduction-to-microeconomics chapter, scarcity of resources forces every economy to answer three central problems:
- What to produce and in what quantities.
- How to produce (which technique — labour-intensive or capital-intensive).
- For whom to produce (how to distribute the output). …
- CBSE 2025Set ANNUAL1 markMCQQ.Read the both given statements and choose the correct option- Assertion (A) : The concept of opportunity cost is widely used in economics. Reason (R) : Because of its importance in economics, opportunity cost is also called the economic cost.(a) Both A and R are correct and R is the correct explanation of A.(b) Both A and R are correct but R is not the correct explanation of A.(c) A is correct but R is incorrect.(d) Both A and R are incorrect.(a) Both A and R are correct and R is the correct explanation of A.(b) Both A and R are correct but R is not the correct explanation of A.(c) A is correct but R is incorrect.(d) Both A and R are incorrect.
›Reveal solutionSolution
Both statements are factually correct, but the Reason does not logically explain the Assertion.
Assertion: 'The concept of opportunity cost is widely used in economics' — TRUE. Because resources are scarce and have alternative uses, almost every economic decision (what to produce, what to consume, how to allocate a budget) involves giving up some alternative, making opportunity cost a central, widely-applied tool across micro and macroeconomics.
Reason: 'Because of its importance in economics, opportunity cost is also called the economic cost' — TRUE as a factual statement (opportunity cost is indeed also known as 'economic cost' in standard terminology).
…
- CBSE 2025Set ANNUAL1 markQ.Which problem is raised by the scarcity of resources during basic economic activities?
›Reveal solutionSolution
Scarcity of resources gives rise to the problem of choice.
Because the resources needed to carry out basic economic activities (land, labour, capital) are limited in supply at any given time, while human wants for the goods and services these resources can produce are unlimited, every economy — however it is organised — is forced to make choices: what combination of goods and services to produce, which technique/method to use, and how to distribute the output among its people. This is t …
- CBSE 2024Set ANNUAL1 markMCQQ.Production possibility curve is (A) Concave to the axis (B) Convex to the axis (C) Parallel to the axis (D) Vertical to the axis
›Reveal solutionSolution
The PPC is concave to the origin due to increasing marginal opportunity cost, so the answer is (A).
In the BSEB Inter / Class-12 Economics syllabus (aligned with the NCERT/CBSE micro introduction), the production possibility curve (PPC) shows the combinations of two goods an economy can produce with given resources and technology, when all resources are fully and efficiently used.
…
- CBSE 2024Set ANNUAL1 markMCQQ.Which of the following is marginal opportunity cost? (A) delta Y / delta I (B) delta Y / delta X (C) MUX / MUY (D) None of these
›Reveal solutionSolution
Marginal opportunity cost = units of good Y sacrificed per extra unit of good X = delta Y / delta X, so the answer is (B).
In the BSEB Inter / Class-12 Economics syllabus, marginal opportunity cost (also called the marginal rate of transformation, MRT) measures how much of one good must be given up to obtain one additional unit of the other good along the PPC.
…
- CBSE 2023Set ANNUAL1 markMCQQ.Opportunity cost is -(a) Numbers of units sacrificed(b) Numbers of units gained(c) Cost of next best alternative(d) None of these
›Reveal solutionSolution
Opportunity cost is the cost of the next best alternative — option (c).
Opportunity cost is the value of the next-best alternative that has to be given up when resources are used for one purpose rather than another. Because resources are scarce and have alternative uses, every choice involves a sacrifice. Henc …
- CBSE 2023Set ANNUAL1 markMCQQ.Reason of the 'problem of choice' in an economy is :(a) Excess of resources(b) Per Capita Income(c) Technological development(d) Scarcity of resources(a) Excess of resources(b) Per Capita Income(c) Technological development(d) Scarcity of resources
›Reveal solutionSolution
Scarcity of resources relative to unlimited wants is the reason the problem of choice arises.
Excess of resources and technological development would, if anything, EASE the problem of choice by expanding what an economy can produce; Per Capita Income is simply a measure of average income, not a cause of the choice problem. The actual cause is scarcity: resources are limited at any given time, while wants are unlimited and resources have alternative uses, so an economy cannot produce everythi …
- CBSE 2022Set ANNUAL1 markQ.Fill in the blank:(iv) Scarcity of resources give rise to the problem of ______.
›Reveal solutionSolution
Scarcity gives rise to the problem of choice.
Because productive resources are scarce relative to unlimited wants, an economy cannot produce everything it desires. It must therefore choose how to allocate its limited resources among competing uses — what to produce, how to produce and for whom to produce. …
- CBSE 2022Set ANNUAL1 markQ.Answer in 10-20 words:(viii) What is meant by production possibility set of an economy?
›Reveal solutionSolution
The production possibility set = all combinations of goods an economy can produce with its given resources and technology.
The production possibility set shows every possible combination of two goods that an economy is able to produce by fully and efficiently employing its limited resources and the available technology. Its boundary is the production possibility frontier (PPF). Points on the frontier represent efficient, full use of resources; a movement along it reflects the opportunity cost of pro …
- CBSE 2022Set ANNUAL1 markMCQQ.Write True or False: Opportunity cost is also called the economic cost.(a) True(b) False
›Reveal solutionSolution
True — opportunity cost is the real/economic cost.
Opportunity cost is the value of the next-best alternative that is given up when a choice is made. Because it measures the real sacrifice involved in using resources for one purpose rather than another, economists treat it as the true …
- CBSE 2022Set ANNUAL1 markQ.Answer in one sentence: What is opportunity cost?
›Reveal solutionSolution
Opportunity cost = value of the next-best alternative given up.
Opportunity cost is the cost of a decision measured in terms of the next-best alternative that is sacrificed. Because resources are scarce and have alternative uses, choosing to use them for one purpose means forgoing another. For example, the opportunity cost of producing more guns is the butter that could have been produced instead. It …
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