What happens to a firm's supply curve when there is technological progress?

The supply curve shifts to the right

The supply curve shifts to the left

The supply curve shifts to the right

The supply curve becomes vertical

The supply curve remains unchanged

What is the defining feature of a perfectly competitive market regarding price-setting?

Firms are price takers and cannot influence market prices.

Firms set their own prices based on production costs.

Firms are price takers and cannot influence market prices.

Firms can set prices above the market price to increase profits.

Firms negotiate prices directly with buyers.

How does an increase in input prices affect a firm's supply curve?

The supply curve shifts to the left.

The supply curve shifts to the right.

The supply curve shifts to the left.

The supply curve remains unchanged.

The supply curve becomes vertical.

What is the short run supply curve of a firm based on?

The firm's average variable cost curve

Which condition must hold for a firm to continue producing in the short run?

Price must be greater than or equal to average variable cost (AVC).

Price must be less than average variable cost (AVC).

Price must be greater than or equal to average total cost (ATC).

Price must be less than average total cost (ATC).

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The Theory of the Firm under Perfect Competition

The Theory of the Firm under Perfect Competit..

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Impact of Technological Progress and Input Prices

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Market Supply Curve

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Perfect Competition

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Learning Objectives

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Learning Objectives

Understand the concept of profit maximization in a firm under perfect competition.
Identify the defining features of a perfectly competitive market.
Analyze the relationship between market price and average/marginal revenue for price-taking firms.
Explain the conditions for a profit-maximizing firm to produce positive output in both short run and long run.
Describe the firm's supply curve in the short run and long run.
Evaluate the effects of technological progress, input price changes, and unit taxes on a firm's supply curve.
Compute total revenue, marginal revenue, and average revenue from given data.
Calculate price elasticity of supply and interpret its significance.

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Revision Notes & Summary

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The Theory of the Firm under Perfect Competition

4.1 Perfect Competition: Defining Features

Large number of buyers and sellers: Each is small compared to the market size.
Homogenous product: Products from different firms are identical.
Free entry and exit: Firms can easily enter or leave the market.
Perfect information: All buyers and sellers are fully informed about prices and products.

4.2 Revenue

Total Revenue (TR): TR = Market Price (p) × Quantity Sold (q)
Average Revenue (AR): For price-taking firms, AR = Market Price.
Marginal Revenue (MR): For price-taking firms, MR = Market Price.

4.3 Profit Maximisation

Profit: Profit = Total Revenue - Total Cost
Conditions for profit maximisation in the short run:
1. p = Short-run Marginal Cost (SMC)
2. SMC is non-decreasing
3. p ≥ Average Variable Cost (AVC)
Conditions for profit maximisation in the long run:
1. p = Long-run Marginal Cost (LRMC)
2. LRMC is non-decreasing
3. p ≥ Long-run Average Cost (LRAC)

4.4 Supply Curves

Short-run Supply Curve: Rising part of SMC curve above minimum AVC.
Long-run Supply Curve: Rising part of LRMC curve above minimum LRAC.

4.5 Determinants of a Firm's Supply Curve

Technological Progress: Shifts supply curve to the right (lower costs).
Input Prices: Increase in input prices shifts supply curve to the left (higher costs).
Unit Tax: Imposes additional cost per unit, shifting supply curve to the left.

4.6 Price Elasticity of Supply

Definition: Price elasticity of supply (es) = Percentage change in quantity supplied / Percentage change in price.
Example: If price rises from Rs 10 to Rs 30, and quantity supplied increases from 200 to 1000, then:
- Percentage change in quantity supplied = (1000 - 200) / 200 × 100 = 400%
- Percentage change in price = (30 - 10) / 10 × 100 = 200%
- Therefore, es = 400% / 200% = 2.

4.7 The Shut Down Point

Short Run Shut Down Point: Minimum AVC where SMC curve intersects AVC curve.
Long Run Shut Down Point: Minimum LRAC curve.

4.8 Normal Profit and Break-even Point

Normal Profit: Minimum profit needed to keep a firm in business, considered an opportunity cost.
Break-even Point: Point where a firm earns only normal profit, at minimum average cost.

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Practice Test – MCQs, True/False

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Multiple Choice Questions

Vertical summation of individual firms' supply curves

Horizontal summation of individual firms' supply curves

Average of individual firms' supply curves

Difference between individual firms' supply curves

Correct Answer: B

Solution:

The market supply curve is derived from the horizontal summation of individual firms' supply curves.

Chapter Concept:

Market Supply Curve

LRMC =

13

, LRAC =

15

LRMC =

10

, LRAC =

12

LRMC =

7

, LRAC =

9

LRMC =

12

, LRAC =

14

Correct Answer: A

Solution:

The unit tax increases both the LRMC and LRAC by Rs 3. Therefore, the new LRMC is

10 + 3 = 13

and the new LRAC is

12 + 3 = 15

Chapter Concept:

Unit Tax Impact on Supply

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True or False

Correct Answer: True

Solution:

The price elasticity of supply measures the responsiveness of quantity supplied to changes in price, calculated as the percentage change in quantity supplied divided by the percentage change in price.

Chapter Concept :

Price Elasticity of Supply

Correct Answer: True

Solution:

The short run supply curve of a firm is indeed the rising part of the short run marginal cost curve (SMC) from and above the minimum average variable cost (AVC), as described in the text.

Chapter Concept :

Supply Curve Derivation

Correct Answer: True

Solution:

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The Theory of the Firm under Perfect Competit..

Study Action Plan (Sorted by Difficulty)

Impact of Technological Progress and Input Prices

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Market Supply Curve

High

Perfect Competition

Learning Objectives

Learning Objectives

Practice, Analyze & Improve 🚀

Revision Notes & Summary

The Theory of the Firm under Perfect Competition

4.1 Perfect Competition: Defining Features

4.2 Revenue

4.3 Profit Maximisation

4.4 Supply Curves

4.5 Determinants of a Firm's Supply Curve

4.6 Price Elasticity of Supply

4.7 The Shut Down Point

4.8 Normal Profit and Break-even Point

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Practice Test – MCQs, True/False

Multiple Choice Questions

Q1.What is the market supply curve derived from?

Correct Answer: B

Q2.A firm operates in a perfectly competitive market and faces a unit tax of Rs 3 per unit of output. If the firm's initial long run marginal cost (LRMC) is 101010 and long run average cost (LRAC) is 121212, what will be the new LRMC and LRAC after the tax is imposed?

Correct Answer: A

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True or False

Q1.The price elasticity of supply is calculated as the percentage change in quantity supplied divided by the percentage change in price.

Correct Answer: True

Q2.The short run supply curve of a firm is derived from the rising part of the short run marginal cost curve above the minimum average variable cost.

Correct Answer: True

Q3.A firm will continue to produce in the short run as long as the market price is greater than or equal to the minimum average variable cost (AVC).

Correct Answer: True

High

Price Elasticity of Supply

High

Profit Maximization under Perfect Competition

High

Revenue Concepts

High

Shut Down and Break-even Points

High

Supply Curve Derivation

High

Unit Tax Impact on Supply

High

Q3.What happens to a firm's supply curve when there is technological progress?

Correct Answer: B

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Q4.If the price of a commodity increases from Rs 10 to Rs 15 and the quantity supplied increases from 100 units to 150 units, what is the price elasticity of supply?

Correct Answer: B

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Q5.What is the defining feature of a perfectly competitive market regarding price-setting?

Correct Answer: B

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Q6.How does an increase in input prices affect a firm's supply curve?

Correct Answer: B

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Q7.What is the short run supply curve of a firm based on?

Correct Answer: B

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Q8.Which condition must hold for a firm to continue producing in the short run?

Correct Answer: A

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Q9.A firm in a perfectly competitive market earns a total revenue of Rs 100 when it sells 10 units of a product. If the market price increases by 50% and the firm sells 15 units, what will be the new total revenue?

Correct Answer: C

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