Q.If the average fixed cost of producing 4 units of output is ₹60, then the value of total fixed cost for producing 5 units will be _____________. (Fill up the blank)
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Cost Concepts: From Everyday Intuition to Economic Precision
Think about the last time you bought something — say, a plate of chole bhature from a roadside stall. The stall owner paid for flour, oil, spices, gas, and the helper's wages. That's the obvious cost. But what about the rent of the cart? The interest on the loan he took to buy the stove? And what about the fact that he could have worked as a driver instead — the income he gave up? That last one is a cost too, though no money changed hands.
That's where economics begins to separate itself from simple accounting. Costs are not just what you pay; they are what you sacrifice.
The Core Idea: Opportunity Cost
The single most important cost concept in economics is opportunity cost. The NCERT Class-12 textbook defines it clearly: opportunity cost is the cost of the next best alternative foregone.
Opportunity cost = value of the next best alternative that you give up when you make a choice.
Why does this matter? Because resources — time, money, land, labour — are scarce. Every choice has a hidden cost: the thing you didn't choose. When the stall owner chooses to run his stall, he gives up the salary he could have earned as a driver. That foregone salary is a real cost, even if it never appears in his cash register.
Explicit vs Implicit Costs
From opportunity cost, we get two categories:
- Explicit costs — actual money payments made to others (wages, rent, raw materials, electricity bills). These are recorded in the books.
- Implicit costs — the value of self-owned resources used in production, for which no explicit payment is made. The owner's own labour, his own capital, his own land — these have opportunity costs that are not paid to anyone else.
In accounting, only explicit costs are counted. In economics, both explicit and implicit costs matter, because economics is about the full sacrifice.
Total, Average, and Marginal Costs
Once we move to production, costs are studied in relation to output. The NCERT textbook introduces these three measures:
Total Cost (TC)
The sum of all costs — explicit and implicit — incurred to produce a given level of output.
Average Cost (AC)
Cost per unit of output.
AC=QTC
where Q is the quantity of output.
Marginal Cost (MC)
The additional cost incurred to produce one more unit of output.
MC=ΔQΔTC
where Δ means "change in".
MC is the cost of the last unit produced. AC is the cost of all units averaged. They behave differently as output changes.
Short-Run vs Long-Run Costs
This distinction is crucial. In the short run, at least one factor of production is fixed (typically capital — factory size, machinery). In the long run, all factors are variable.
Short-Run Cost Categories
| Cost | Symbol | Definition |
|---|---|---|
| Total Fixed Cost | TFC | Cost that does not change with output (rent, insurance, interest on loans) |
| Total Variable Cost | TVC | Cost that changes with output (raw materials, wages of daily workers, electricity) |
| Total Cost | TC | TC=TFC+TVC |
From these, we derive:
- Average Fixed Cost (AFC) = QTFC — falls continuously as output rises.
- Average Variable Cost (AVC) = QTVC — typically U-shaped.
- Average Cost (AC) = QTC=AFC+AVC
A common mistake: thinking that AC and AVC are the same. They are not. AC includes AFC, so AC always lies above AVC. The gap between them is AFC, which shrinks as output increases.
The Shape of the Curves
Imagine a graph with output on the horizontal axis and cost on the vertical axis.
- TFC is a horizontal straight line — it never changes. …
Part (b)Concept understanding — Cost Concepts
Cost Concepts: From Everyday Intuition to Economic Precision
Think about the last time you bought something — say, a plate of chole bhature from a roadside stall. The stall owner paid for flour, oil, spices, gas, and the helper's wages. That's the obvious cost. But what about the rent of the cart? The interest on the loan he took to buy the stove? And what about the fact that he could have worked as a driver instead — the income he gave up? That last one is a cost too, though no money changed hands.
That's where economics begins to separate itself from simple accounting. Costs are not just what you pay; they are what you sacrifice.
The Core Idea: Opportunity Cost
The single most important cost concept in economics is opportunity cost. The NCERT Class-12 textbook defines it clearly: opportunity cost is the cost of the next best alternative foregone.
Opportunity cost = value of the next best alternative that you give up when you make a choice.
Why does this matter? Because resources — time, money, land, labour — are scarce. Every choice has a hidden cost: the thing you didn't choose. When the stall owner chooses to run his stall, he gives up the salary he could have earned as a driver. That foregone salary is a real cost, even if it never appears in his cash register.
Explicit vs Implicit Costs
From opportunity cost, we get two categories:
- Explicit costs — actual money payments made to others (wages, rent, raw materials, electricity bills). These are recorded in the books.
- Implicit costs — the value of self-owned resources used in production, for which no explicit payment is made. The owner's own labour, his own capital, his own land — these have opportunity costs that are not paid to anyone else.
In accounting, only explicit costs are counted. In economics, both explicit and implicit costs matter, because economics is about the full sacrifice.
Total, Average, and Marginal Costs
Once we move to production, costs are studied in relation to output. The NCERT textbook introduces these three measures:
Total Cost (TC)
The sum of all costs — explicit and implicit — incurred to produce a given level of output.
Average Cost (AC)
Cost per unit of output.
AC=QTC
where Q is the quantity of output.
Marginal Cost (MC)
The additional cost incurred to produce one more unit of output.
MC=ΔQΔTC
where Δ means "change in".
MC is the cost of the last unit produced. AC is the cost of all units averaged. They behave differently as output changes.
Short-Run vs Long-Run Costs
This distinction is crucial. In the short run, at least one factor of production is fixed (typically capital — factory size, machinery). In the long run, all factors are variable.
Short-Run Cost Categories
| Cost | Symbol | Definition |
|---|---|---|
| Total Fixed Cost | TFC | Cost that does not change with output (rent, insurance, interest on loans) |
| Total Variable Cost | TVC | Cost that changes with output (raw materials, wages of daily workers, electricity) |
| Total Cost | TC | TC=TFC+TVC |
From these, we derive:
- Average Fixed Cost (AFC) = QTFC — falls continuously as output rises.
- Average Variable Cost (AVC) = QTVC — typically U-shaped.
- Average Cost (AC) = QTC=AFC+AVC
A common mistake: thinking that AC and AVC are the same. They are not. AC includes AFC, so AC always lies above AVC. The gap between them is AFC, which shrinks as output increases.
The Shape of the Curves
Imagine a graph with output on the horizontal axis and cost on the vertical axis.
- TFC is a horizontal straight line — it never changes. …
Part (a)
Total Fixed Cost (TFC) does not change with output. Given AFC at 4 units is ₹60:
TFC=AFC×Q=60×4=₹240 …
Part (a): TFC is constant with output; TFC = AFC × Q = 60 × 4 = ₹240, so for 5 units it is still ₹240.
Part (b): Two examples of variable cost — cost of raw materials and wages of casual labour.
Part (a)
Average Fixed Cost (AFC) is total fixed cost spread over output: AFC=QTFC. The key property of Total Fixed Cost (TFC) is that it does not vary with the level of output in the short run — it is the same at 0, 4, or 5 units.
Recover TFC from the given data at Q=4:
TFC=AFC×Q=60×4=₹240
Because TFC is fixed, producing 5 units does not change it. …
- BSEH Haryana Senior Secondary Class 12 (Commerce) 2026Set ANNUAL1 markMCQQ.When production is zero, then Total Variable Cost will be :(a) Equal to Total Cost(b) Zero(c) Total Fixed Cost(d) None of these
›Reveal solutionSolution
At zero output, TVC = 0 (only fixed costs remain).
Total Cost (TC) = Total Fixed Cost (TFC) + Total Variable Cost (TVC).
- TFC (rent, salary of permanent staff, insurance) is incurred even at zero output and stays constant. …
- BSEH Haryana Senior Secondary Class 12 (Commerce) 2026Set ANNUAL1 markMCQQ.Assertion (A) : Average Cost is U shaped. Reason (R) : Due to Internal Economies and Diseconomies.(a) Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A).(b) Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of Assertion (A).(c) Assertion (A) is true, but Reason (R) is false.(d) Assertion (A) is false, but Reason (R) is true.
›Reveal solutionSolution
Both true; R correctly explains A.
The average cost curve is U-shaped. As output expands, the firm first enjoys internal economies (better division of labour, bulk buying, efficient machinery), so average cost falls. Beyond a point, internal diseconomies (management becomes unwieldy, coordination problems) set in and average cost rises. This fall-then-ris …
- BSEH Haryana Senior Secondary Class 12 (Commerce) 2025Set ANNUAL1 markMCQQ.When the production level is zero, than variable cost is :(a) Positive(b) Negative(c) Zero(d) All of the above
›Reveal solutionSolution
At zero output, variable cost = 0.
Total Variable Cost (raw material, power, casual wages) depends on output and is incurred only when goods are produced. At zero output no variable factor is …
- BSEH Haryana Senior Secondary Class 12 (Commerce) 2023Set ANNUAL1 markQ.Fill in the blank : Total Cost = Total Fixed Cost + ............... .
›Reveal solutionSolution
TC = TFC + TVC.
The total cost of producing any level of output is made up of the cost of fixed factors (Total Fixed Cost) plus the cost of variable factors ( …
- BSEH Haryana Senior Secondary Class 12 (Commerce) 2020Set ANNUAL1 markMCQQ.When level of Production is Zero then the Fixed Cost is :(a) Positive(b) Negative(c) Zero(d) Equal to Variable Cost
›Reveal solutionSolution
At zero output, fixed cost is positive (variable cost is zero).
Total Fixed Cost is the cost of fixed factors (rent, insurance, permanent salaries) that must be paid whatever the level of output — even at zero output. So at zero production the fixe …
- BSEH Haryana Senior Secondary Class 12 (Commerce) 2020Set ANNUAL1 markMCQQ.State whether the following statement is True or False : Total Cost = Total Fixed Cost + Total Variable Cost.(a) True(b) False
›Reveal solutionSolution
True — TC = TFC + TVC.
The total cost of producing any output is the sum of the cost of fixed factors (TFC) and the cost of variable factors (T …
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