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Section 2.3 HL
Theory of the Firm
2.3 A Tale of Two Firms
Apple is currently the most popular and well loved firm in the US while JAL, to the dismay of the Japanese, recently declared itself bankrupt with 2.3 Trillion Yen in debt.
How can one firm be so successful while fail so spectacularly?
2.3 A Tale of Two Firms and Theory of the Firm
What advice could an economist give Apple to help it stay so successful and what advice could they give JAL so that it once again becomes the most successful airline in Asia.
How should the firm use
resources to make a profit?
How should the firm reduce costs, be
efficient and maximize profits?
What is the best price to
obtain the most revenue?
How many units should the firm produce to make the most
revenue?
How should the firm plan for the future in
terms of price and quantity?
What are the advantages and
risks of the firms market
environment?
How can the firm respond to
the business cycle?
Crucial Questions All Firm Face
Theories about a firm’s behavior in the market place, the nature of that market place and how they produce
and price their goods.
Cost Theory
Revenue Theory
Profit Theory
Theory of the Firm Defined
Theory of the Firm The Goal
► Provide advice
► about the following:
► The best price
► The best output
► The most profit
► To breakeven price
► The shutdown price
Theory of the Firm
=Profit
-Fixed Costs Variable Costs
TRQuantity PriceX
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Cost Theory
Types of Costs: Fixed and Variable Costs
Fixed Costs
Variable Costs
Product
Fixed Costs
Variable Costs
Costs and Output (Product)
Variable Costs (VC)are the focus as Fixed Costs (FC)cannot change in the short term.
Total Product (TP)= total
output of a firm
Average Product (AP) = TP/V (Units of the
Variable Factor)
Marginal Product (MP) = Change
in TP/Change in V (Units of the
Variable Factor)
Ways to Measure Output
The Total Product Curve
Average and Marginal Product Curves
As extra units of a VF are added to a given quantity of a FF, the output per unit of the VF will
eventually diminish
Diminishing Average Returns
As extra units of a VF are added to a given quantity of a FF, the output from
each additional unit of the VF will eventually diminish.
Diminishing Marginal Returns
Total Costs (TC) = total cost to produce a certain output. TC =
TFC + TVC
Total Variable Costs (TVC) = total cost of the variable assets that a firm uses in a
given period of time.
Total Fixed Costs (TFC) = total cost of fixed assets
used in a given time
period.
Tota
l Costs
Total Fixed Costs (TFC)
Total Variable
Costs (TVC)
Total Costs
TC
Avera
ge C
osts
Average Fixed Costs
(AFC)
Average Variable
Costs (AVC)
Average Total Costs
(ATC)
Marg
inal C
osts
Marginal Cost (MC) = increase in
TC of producing an extra unit of
output
TFC, TVC and TC
Cost Curves
LRAC A firm altering all its factors to meet increasing demand
Economies of scale LRAC as Output
constant
Diseconomies of scale
LRAC as Output constant
Constant returns to scale
LRAC is constant as Output
Economies and Diseconomies of Scale
Economies and Diseconomies of Scale
Economies of Scale
Economies of Scale
Specialization
Bulk Buying of Inputs
Financial Savings
Transport Savings
Technology
Advertising and
promotion
Economies of Scale
Diseconomies of Scale
Control and Communicati
on
Alienation/work
satisfaction
Click icon to add pictureRevenue Theory
Total Revenue
Quantity Price
Total Revenu
e
X
=
Total Revenue
Quantity Price
Total Revenu
e
X
=
Marginal Revenue
Change in
Revenue
Change in
Quantity
Marginal Revenue
÷
=
Example 1 Demand is perfectly elastic PED = Infinity
Revenue Curves
Price ($)
Demand (q)
TR AR MR
5 1 5 5 5
5 2 10 5 5
5 3 15 5 5
5 4 20 5 5
5 5 25 5 5
5 6 30 5 5
5 7 35 5 5
Revenue Curves: Perfectly Elastic Demand
5
Price
Output
D=AR=MR
Revenue Curves for Normal Demand Curves
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Profit Theory
Accounting Profit
Total Revenue
Debit Total Fixed Costs
Debit Total Variable
CostsProfit
Economic Profit
Total Revenue
Debit Total Fixed Costs
Debit Total Variable
Costs
DebitOpportunity
CostsProfit
Firm A Firm B Firm C
TR 200,000 200,000 200,000
TFC 40,000 40,000 40,000
TVC 80,000 100,000 120,000
Opportunity Cost 60,000 60,000 60,000
TC 180,000 200000 220,000
Profit and Loss
Which firm is making a Profit, which is making and Abnormal Profit and which is making a loss?
Firm A Firm B Firm C
TR 200,000 200,000 200,000
TFC 40,000 40,000 40,000
TVC 80,000 100,000 120,000
Opportunity Cost 60,000 60,000 60,000
TC 180,000 200000 220,000
Profit and Loss
Abnormal Profit Normal Profit Loss
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Firm X Firm Y Firm Z
TR 80,000 120,000 150,000
TFC (including OC)
100,000 100,000 100,000
TVC 100,000 120,000 140,000
TC 200,000 220,000 240,000
Loss 120,000 100,000 90,000
What advice would you give these firms?
Shut Down Price and the Break Even Price
Firm X Firm Y Firm Z
TR 80,000 120,000 150,000
TFC (in OC) 100,000 100,000 100,000
TVC 100,000 120,000 140,000
TC 200,000 220,000 240,000
Loss 120,000 100,000 90,000
Firm X should shut down as TR <TVC and TFCFirm Y should continue production as TR >TVC.Firm Z should continue to produce as TR >TVC& part of its TFC
Shut Down
Price = AVC
Break Even
Price = ATC
Determining the Shut Down Price and the Break Even Price
Shut Down Price
Break Even Price = P1 = ATC
When MR > MC then a firm
should increase production until
MC = MR
Profit Maximizing Level of Output
Profit Maximizing Level of Output with Perfectly Elastic Demand
Profit Maximizing Level of Output with Perfectly Elastic Demand
Profit Maximizing Level of Output with Normal Demand
Profit Maximizing Level of Output with Normal Demand
The profit per unit of output must be the difference
between the AR and the AC.
Therefore P = AR at q – AC at q X
Quantity (q)
Profit Maximizing Level of Output with Normal Demand
Normal Profit Normal Demand
Abnormal Profit Normal Demand
Loss Normal Demand
Is it alw
ays a
bout p
rofit?
Revenue and Sales maximization• Strategic =
increase market share in SR.
• Ignorance
Maximizing Employment • Large
workforce = Success
Environment AimsIncur added costs to be environmentally sustainable.
Satisficing • Keep
shareholders satisfied with performance
Profit, Sales and Revenue Maximization?
Profit, Sales and Revenue Maximization?
Profit, Sales and Revenue Maximization?
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Price Discrimination
Definition
Price Discrimination
• When firms actively adjust prices according to the willingness/ability of different consumers to pay.
Types of Price Discrimination
First Degree
• charge whatever the market will bear e.g. auction.
Second Degree
• discount for quantity purchases
Third Degree
• market separated into distinct groups
Third Degree Discrimination
Time•peak and off peak toll roads
Age•seniors, adults and children
Type •domestic and industrial uses of electricity
Income•Means tested government services
Location•books in Australia and US
Reasons for Price
Discrimination
Increase profits
Increase output and gain from economies
of scale
Gain market
share by predatory
pricing
Build brand loyalty
Promote goodwill
Achieve fairness
Pre-conditions for Price Discrimination
Different market
segments identifiable
Firm have market power
Arbitrage can be limited
Price Discrimination ExampleTotal Ticket Sales
Price Discrimination ExampleAdult Tickets
Price Discrimination ExampleAdult Tickets
Price Discrimination Example
MC = MR
600 tickets
at $5
TR = $3000
Adults are
less price
sensitive
therefore
the MR
Curve is
kinked.
Charging
Adults $9
yields
$1800
(200 x $9)
Charging
Students $7
yields
$2800
(400 x $7)
New TR=
$3600
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Efficiency
Productive Efficiency and Allocative Efficiency
Productive Efficiency is
achieved when goods
are produced at the lowest
possible cost per unit., i.e.
Minimum Average
Cost
Allocative Efficiency is
achieved when
resources are not
wasted i.e. Supply =
Demand and Price = MC
Productive Efficiency: Resources are not wasted
Allocative Efficiency / Socially Optimum Level of Output
Perfect Competition Versus Monopoly
Perfect Competition Versus Monopoly
Monopolies
Pros of Monopolies
Cons of Monopolies
Competition & the Theory of Contestable Markets
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Efficiency
Traditional Theories of Market Structure and Competition
Number of Firms
in Marke
t
Degree of Competiti
onInverse Relationship
Theory of Contestable Markets
Barriers to
Entry of
Potential
Rivals
Actual Degree of
Competitio
nInverse Relationship
Theory of Contestable Markets
If market is contestable (low barriers to
entry),
firms
will perceive
a threat of competition.
Accordingly
firms will
behave
competitivelyand
greater
efficiency and lowe
r prices will resul
t
Theory of Contestable Markets
Threat of
competition
influences price
and output of all firms
If cost of entry and exit is zero (perfectly
contestable market), firms will
challenge a firm that is
making abnormal profits and therefore that firm will keep
prices low.
In reality most firms
when entering a market will be faced
with sunk cost, i. e. costs that can not be
recouped by transferring
them to another
use.