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title: "CA Foundation | Supply | Chanakya Commerce Classes"
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# CA Foundation | Supply | Chanakya Commerce Classes

CA Foundation Paper 4 Business Economics Supply chapter-wise study material for May 2026 exam onwards by Chanakya Commerce Classes.

Canonical URL: https://www.chanakyaclasses.com/notes/supply

CA Foundation · Paper 4 · Business Economics
Supply
Unit 3 · Chapter 2 · MCQ-focused revision sheet for May 2026 exam onwards
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Study material aligned with the current Business Economics section.
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Supply
Unit 3 · Chapter 2 · MCQ-focused revision sheet for May 2026 exam onwards
MCQ Priority
Concept Clarity
Quick Revision
Crux First
What you must remember for MCQs
Supply = willingness + ability + time element.
Supply is a
flow concept
.
Supply ≠ stock
.
Law of Supply =
direct relationship
between price and quantity supplied.
Determinants of supply = price, cost, technology, related goods, government policy, number of sellers, expectations, natural factors.
Movement in supply = due to
price
.
Shift in supply = due to
other factors
.
Elasticity of supply = responsiveness of supply to change in price.
Market supply =
horizontal addition
of all firms.
Equilibrium =
demand = supply
.
1. Meaning of Supply
Definition
Supply means the quantity a producer is
willing and able
to offer at different prices during a given time period.
Three Key Points
Supply is what is
offered
, not what is sold.
It requires:
Willingness
Ability
Supply is a
flow concept
, so time period is essential.
Example:
100 units per day is supply. Merely having stock is not supply.
MCQ Traps
Stock is not the same as supply.
Supply must include a time period.
2. Determinants of Supply
1. Price of the Commodity
Price rises → supply rises.
This is the core determinant.
2. Cost of Production
Cost rises → supply falls.
Cost falls → supply rises.
Includes wages, raw material and similar input costs.
3. Technology
Better technology lowers cost and raises supply.
4. Price of Related Goods
Competitive goods:
If price of substitute good rises, supply of this good may fall.
Joint goods:
Supply moves together.
5. Government Policy
Tax rises → supply falls.
Subsidy rises → supply rises.
6. Number of Sellers
More firms in the market → supply rises.
7. Future Expectations
If producers expect price to rise in future, they may hold stock now, so present supply falls.
8. Natural Factors
Especially important in agriculture.
Weather affects supply.
Important:
ICAI often asks determinants of supply directly as a list-based MCQ.
3. Law of Supply
Statement
Other things remaining constant,
price rises and supply rises
.
Supply Schedule and Supply Curve
Supply schedule shows the relationship between price and quantity supplied.
Supply curve is generally
upward sloping
.
Why Upward Sloping?
Profit motive
Entry of new firms
Better use of resources
4. Movement vs Shift in Supply
Movement in Supply
Also called
change in quantity supplied
.
Caused by
price change only
.
Shown by movement along the same supply curve.
Shift in Supply
Also called
change in supply
.
Caused by
other determinants
.
Shown by shift of the entire supply curve.
Examples of Increase in Supply
Better technology
Lower cost
Subsidy
Examples of Decrease in Supply
Tax
Higher cost
Situation
Answer
Price changes
Movement
Cost or technology changes
Shift
ICAI MCQ Gold
Movement = caused by price change.
Shift = caused by non-price factors.
5. Elasticity of Supply
Definition
Elasticity of supply means the
responsiveness of supply to change in price
.
Es = % change in Qs / % change in P
Types of Elasticity of Supply
Type
Meaning
Perfectly Elastic
Infinite response
Elastic (>1)
High response
Unitary (=1)
Equal response
Inelastic (<1)
Low response
Perfectly Inelastic
No change
Diagram Logic:
Steeper supply curve means inelastic supply. Flatter supply curve means elastic supply.
6. Factors Affecting Elasticity of Supply
1. Nature of Goods
Perishable goods → inelastic supply
Durable goods → elastic supply
2. Time Period
Very short run:
Supply fixed, so perfectly inelastic
Short run:
Some flexibility exists
Long run:
Full flexibility, so supply becomes more elastic
3. Availability of Factors
Easy availability of factors makes supply more elastic.
4. Level of Capacity Utilisation
If idle capacity exists, supply is more elastic.
Very Important:
As time period increases, elasticity of supply generally increases.
7. Market Supply
Definition
Market supply means the
sum of supply of all firms
in the market.
It is obtained by
horizontal addition
of individual supply curves.
8. Equilibrium
Definition
Equilibrium occurs when
demand equals supply
.
Effects of Disequilibrium
Excess demand → price rises
Excess supply → price falls
Adjustment Mechanism
Market forces move automatically towards equilibrium.
Final Quick Revision
Strict ICAI-based recall
Supply = willingness + ability + time
Supply is not stock
Law of Supply = direct relationship
Determinants = cost, technology, tax, related goods, expectations and more
Movement = because of price
Shift = because of other factors
Elasticity = responsiveness of supply
As time increases, elasticity usually increases
Market supply = sum of all firms
Equilibrium = demand equals supply
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CA Foundation · Paper 4 · Business Economics · Unit 3: Supply
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