2.5 — Short Run Profit Maximization

ECON 306 • Microeconomic Analysis • Fall 2022

Ryan Safner
Associate Professor of Economics
safner@hood.edu
ryansafner/microF22
microF22.classes.ryansafner.com

Outline

The Firm's Short-Run Supply Decision

Revenues

Revenues for Firms in Competitive Industries I

Demand for a firm’s product is perfectly elastic at the market price

Revenues for Firms in Competitive Industries I

Demand for a firm’s product is perfectly elastic at the market price
Where did the supply curve come from? You’ll know today

Revenues for Firms in Competitive Industries II

Total Revenue $R (q) = p q$

Average and Marginal RevenuesAverage Revenue: revenue per unit of output
AR(q)=RqAR(q)=RqAR(q)AR(q) is by definition equal to the price! (Why?)

Average and Marginal Revenues

Average Revenue: revenue per unit of output $A R (q) = \frac{R}{q}$
- $A R (q)$ is by definition equal to the price! (Why?)
Marginal Revenue: change in revenues for each additional unit of output sold: $M R (q) = \frac{Δ R (q)}{Δ q}$
- Calculus: first derivative of the revenues function
- For a competitive firm (only), MR(q) = p, i.e. the price!

Average and Marginal Revenues: Example

Example: A firm sells bushels of wheat in a very competitive market. The current market price is $10/bushel.

Average and Marginal Revenues: Example

Example: A firm sells bushels of wheat in a very competitive market. The current market price is $10/bushel.

For the 1^st bushel sold:

What is the total revenue?
What is the average revenue?

Average and Marginal Revenues: Example

Example: A firm sells bushels of wheat in a very competitive market. The current market price is $10/bushel.

For the 1^st bushel sold:

What is the total revenue?
What is the average revenue?

For the 2^nd bushel sold:

What is the total revenue?
What is the average revenue?
What is the marginal revenue?

Total Revenue, Example: Visualized

$q$	$R (q)$
$0$	$0$
$1$	$10$
$2$	$20$
$3$	$30$
$4$	$40$
$5$	$50$
$6$	$60$
$7$	$70$
$8$	$80$
$9$	$90$
$10$	$100$

Average and Marginal Revenue, Example: Visualized

$q$	$R (q)$	$A R (q)$	$M R (q)$
$0$	$0$	$-$	$-$
$1$	$10$	$10$	$10$
$2$	$20$	$10$	$10$
$3$	$30$	$10$	$10$
$4$	$40$	$10$	$10$
$5$	$50$	$10$	$10$
$6$	$60$	$10$	$10$
$7$	$70$	$10$	$10$
$8$	$80$	$10$	$10$
$9$	$90$	$10$	$10$
$10$	$100$	$10$	$10$

Profits

Recall: The Firm's Two Problems

1^st Stage: firm's profit maximization problem:

Choose: < output >
In order to maximize: < profits >

2^nd Stage: firm's cost minimization problem:

Choose: < inputs >
In order to minimize: < cost >
Subject to: < producing the optimal output >

Minimizing costs $⟺$ maximizing profits

Visualizing Total Profit As $R (q) - C (q)$

$π (q) = R (q) - C (q)$

Visualizing Total Profit As $R (q) - C (q)$

$π (q) = R (q) - C (q)$

Visualizing Total Profit As $R (q) - C (q)$

$π (q) = R (q) - C (q)$
Graph: find $q^{*}$ to max $π ⟹ q^{*}$ where max distance between $R (q)$ and $C (q)$

Visualizing Total Profit As $R (q) - C (q)$

$π (q) = R (q) - C (q)$
Graph: find $q^{*}$ to max $π ⟹ q^{*}$ where max distance between $R (q)$ and $C (q)$
Slopes must be equal: $M R (q) = M C (q)$

Visualizing Total Profit As $R (q) - C (q)$

$π (q) = R (q) - C (q)$
Graph: find $q^{*}$ to max $π ⟹ q^{*}$ where max distance between $R (q)$ and $C (q)$
Slopes must be equal: $M R (q) = M C (q)$

At $q^{*} = 5$ :
- $R (q) = 50$
- $C (q) = 40$
- $π (q) = 10$

Visualizing Profit Per Unit As $M R (q)$ and $M C (q)$

At low output $q < q^{*}$ , can increase $π$ by producing more: $M R (q) > M C (q)$

Visualizing Profit Per Unit As $M R (q)$ and $M C (q)$

At high output $q > q^{*}$ , can increase $π$ by producing less: $M R (q) < M C (q)$

Visualizing Profit Per Unit As $M R (q)$ and $M C (q)$

$π$ is maximized where $M R (q) = M C (q)$

Comparative Statics

If Market Price Changes I

Suppose the market price increases
Firm (always setting MR=MC) will respond by producing more

If Market Price Changes II

Suppose the market price decreases
Firm (always setting MR=MC) will respond by producing less

The Firm’s Supply Curve

The firm’s marginal cost curve is its supply curve^‡ $p = M C (q)$
- How it will supply the optimal amount of output in response to the market price
- Firm always sets its price equal to its marginal cost

^‡ Mostly...there is an important exception we will see shortly!

Calculating Profit

Calculating (Average) Profit as AR(q)-AC(q)

Profit is $π (q) = R (q) - C (q)$

Calculating (Average) Profit as AR(q)-AC(q)

Profit is $π (q) = R (q) - C (q)$
Profit per unit can be calculated as: $\begin{aligned} \frac{π (q)}{q} & = A R (q) - A C (q) \\ = p - A C (q) \end{aligned}$

Calculating (Average) Profit as AR(q)-AC(q)

Profit is $π (q) = R (q) - C (q)$
Profit per unit can be calculated as: $\begin{aligned} \frac{π (q)}{q} & = A R (q) - A C (q) \\ = p - A C (q) \end{aligned}$
Multiply by $q$ to get total profit: $π (q) = q [p - A C (q)]$

Calculating (Average) Profit as AR(q)-AC(q)

At market price of p* = $10
At q* = 5 (per unit):
At q* = 5 (totals):

Calculating (Average) Profit as AR(q)-AC(q)

At market price of p* = $10
At q* = 5 (per unit):
- AR(5) = $10/unit
At q* = 5 (totals):
- R(5) = $50

Calculating (Average) Profit as AR(q)-AC(q)

At market price of p* = $10
At q* = 5 (per unit):
- AR(5) = $10/unit
- AC(5) = $7/unit
At q* = 5 (totals):
- R(5) = $50
- C(5) = $35

Calculating (Average) Profit as AR(q)-AC(q)

At market price of p* = $10
At q* = 5 (per unit):
- AR(5) = $10/unit
- AC(5) = $7/unit
- A $π$ (5) = $3/unit
At q* = 5 (totals):
- R(5) = $50
- C(5) = $35
- $π$ = $15

Calculating (Average) Profit as AR(q)-AC(q)

At market price of p* = $2
At q* = 1 (per unit):
At q* = 1 (totals):

Calculating (Average) Profit as AR(q)-AC(q)

At market price of p* = $2
At q* = 1 (per unit):
- AR(1) = $2/unit
At q* = 1 (totals):
- R(1) = $2

Calculating (Average) Profit as AR(q)-AC(q)

At market price of p* = $2
At q* = 1 (per unit):
- AR(1) = $2/unit
- AC(1) = $10/unit
At q* = 1 (totals):
- R(1) = $2
- C(1) = $10

Calculating (Average) Profit as AR(q)-AC(q)

At market price of p* = $2
At q* = 1 (per unit):
- AR(1) = $2/unit
- AC(1) = $10/unit
- A $π$ (1) = -$8/unit
At q* = 1 (totals):
- R(1) = $2
- C(1) = $10
- $π$ (1) = -$8

Short-Run Shut-Down Decisions

What if a firm's profits at $q^{*}$ are negative (i.e. it earns losses)?
Should it produce at all?

Short-Run Shut-Down Decisions

Suppose firm chooses to produce nothing $(q = 0)$ :
If it has fixed costs $(f > 0)$ , its profits are:

$\begin{aligned} π (q) & = p q - C (q) \end{aligned}$

Short-Run Shut-Down Decisions

Suppose firm chooses to produce nothing $(q = 0)$ :
If it has fixed costs $(f > 0)$ , its profits are:

$\begin{aligned} π (q) & = p q - C (q) \\ π (q) & = p q - f - V C (q) \end{aligned}$

Short-Run Shut-Down Decisions

Suppose firm chooses to produce nothing $(q = 0)$ :
If it has fixed costs $(f > 0)$ , its profits are:

$\begin{aligned} π (q) & = p q - C (q) \\ π (q) & = p q - f - V C (q) \\ π (0) & = - f \end{aligned}$

i.e. it (still) pays its fixed costs

Short-Run Shut-Down Decisions

A firm should choose to produce no output $(q = 0)$ only when:

$\begin{aligned} π from producing & < π from not producing \end{aligned}$

Short-Run Shut-Down Decisions

A firm should choose to produce no output $(q = 0)$ only when:

$\begin{aligned} π from producing & < π from not producing \\ π (q) & < - f \end{aligned}$

Short-Run Shut-Down Decisions

A firm should choose to produce no output $(q = 0)$ only when:

$\begin{aligned} π from producing & < π from not producing \\ π (q) & < - f \\ p q - V C (q) - f & < - f \end{aligned}$

Short-Run Shut-Down Decisions

A firm should choose to produce no output $(q = 0)$ only when:

$\begin{aligned} π from producing & < π from not producing \\ π (q) & < - f \\ p q - V C (q) - f & < - f \\ p q - V C (q) & < 0 \end{aligned}$

Short-Run Shut-Down Decisions

A firm should choose to produce no output $(q = 0)$ only when:

$\begin{aligned} π from producing & < π from not producing \\ π (q) & < - f \\ p q - V C (q) - f & < - f \\ p q - V C (q) & < 0 \\ p q & < V C (q) \end{aligned}$

Short-Run Shut-Down Decisions

A firm should choose to produce no output $(q = 0)$ only when:

$\begin{aligned} π from producing & < π from not producing \\ π (q) & < - f \\ p q - V C (q) - f & < - f \\ p q - V C (q) & < 0 \\ p q & < V C (q) \\ p & < A V C (q) \end{aligned}$

Shut down price: firm will shut down production in the short run when $p < A V C (q)$

The Firm’s Short Run Supply Decision

The Firm's Short Run Supply Decision

Firm’s short run supply curve:

{\begin{cases} p = M C (q) & if p \geq A V C \\ q = 0 & If p < A V C \end{cases}

The Firm's Short Run Supply Decision

Firm’s short run supply curve:

{\begin{cases} p = M C (q) & if p \geq A V C \\ q = 0 & If p < A V C \end{cases}

Summary:

1. Choose $q^{*}$ such that $M R (q) = M C (q)$

Summary:

1. Choose $q^{*}$ such that $M R (q) = M C (q)$

2. Profit $π = q [p - A C (q)]$

Summary:

1. Choose $q^{*}$ such that $M R (q) = M C (q)$

2. Profit $π = q [p - A C (q)]$

3. Shut down if $p < A V C (q)$

Summary:

1. Choose $q^{*}$ such that $M R (q) = M C (q)$

2. Profit $π = q [p - A C (q)]$

3. Shut down if $p < A V C (q)$

Firm's short run (inverse) supply:

${\begin{cases} p = M C (q) & if p \geq A V C \\ q = 0 & If p < A V C \end{cases}$

Choosing the Profit-Maximizing Output $q^{*}$ : Example

Example: Bob’s barbershop gives haircuts in a very competitive market, where barbers cannot differentiate their haircuts. The current market price of a haircut is $15. Bob’s daily short run costs are given by:

$\begin{aligned} C (q) & = 0.5 q^{2} \\ M C (q) & = q \end{aligned}$

How many haircuts per day would maximize Bob’s profits?
How much profit will Bob earn per day?
Find Bob’s shut down price.
Write an equation for Bob’s short-run supply curve

2.5 — Short Run Profit Maximization

ECON 306 • Microeconomic Analysis • Fall 2022

Ryan Safner
Associate Professor of Economics
safner@hood.edu
ryansafner/microF22
microF22.classes.ryansafner.com

Outline

Revenues

Profits

Comparative Statics

Calculating Profit

Short-Run Shut-Down Decisions

The Firm's Short-Run Supply Decision

Revenues

Revenues for Firms in Competitive Industries I

Demand for a firm’s product is perfectly elastic at the market price

Revenues for Firms in Competitive Industries I

Demand for a firm’s product is perfectly elastic at the market price
Where did the supply curve come from? You’ll know today

Revenues for Firms in Competitive Industries II

Total Revenue $R (q) = p q$

Average and Marginal RevenuesAverage Revenue: revenue per unit of output
AR(q)=RqAR(q)=RqAR(q)AR(q) is by definition equal to the price! (Why?)

Average and Marginal Revenues

Average Revenue: revenue per unit of output $A R (q) = \frac{R}{q}$
- $A R (q)$ is by definition equal to the price! (Why?)
Marginal Revenue: change in revenues for each additional unit of output sold: $M R (q) = \frac{Δ R (q)}{Δ q}$
- Calculus: first derivative of the revenues function
- For a competitive firm (only), MR(q) = p, i.e. the price!

Average and Marginal Revenues: Example

Example: A firm sells bushels of wheat in a very competitive market. The current market price is $10/bushel.

Average and Marginal Revenues: Example

Example: A firm sells bushels of wheat in a very competitive market. The current market price is $10/bushel.

For the 1^st bushel sold:

What is the total revenue?
What is the average revenue?

Average and Marginal Revenues: Example

Example: A firm sells bushels of wheat in a very competitive market. The current market price is $10/bushel.

For the 1^st bushel sold:

What is the total revenue?
What is the average revenue?

For the 2^nd bushel sold:

What is the total revenue?
What is the average revenue?
What is the marginal revenue?

Total Revenue, Example: Visualized

$q$	$R (q)$
$0$	$0$
$1$	$10$
$2$	$20$
$3$	$30$
$4$	$40$
$5$	$50$
$6$	$60$
$7$	$70$
$8$	$80$
$9$	$90$
$10$	$100$

Average and Marginal Revenue, Example: Visualized

$q$	$R (q)$	$A R (q)$	$M R (q)$
$0$	$0$	$-$	$-$
$1$	$10$	$10$	$10$
$2$	$20$	$10$	$10$
$3$	$30$	$10$	$10$
$4$	$40$	$10$	$10$
$5$	$50$	$10$	$10$
$6$	$60$	$10$	$10$
$7$	$70$	$10$	$10$
$8$	$80$	$10$	$10$
$9$	$90$	$10$	$10$
$10$	$100$	$10$	$10$

Profits

Recall: The Firm's Two Problems

1^st Stage: firm's profit maximization problem:

Choose: < output >
In order to maximize: < profits >

2^nd Stage: firm's cost minimization problem:

Choose: < inputs >
In order to minimize: < cost >
Subject to: < producing the optimal output >

Minimizing costs $⟺$ maximizing profits

Visualizing Total Profit As $R (q) - C (q)$

$π (q) = R (q) - C (q)$

Visualizing Total Profit As $R (q) - C (q)$

$π (q) = R (q) - C (q)$

Visualizing Total Profit As $R (q) - C (q)$

$π (q) = R (q) - C (q)$
Graph: find $q^{*}$ to max $π ⟹ q^{*}$ where max distance between $R (q)$ and $C (q)$

Visualizing Total Profit As $R (q) - C (q)$

$π (q) = R (q) - C (q)$
Graph: find $q^{*}$ to max $π ⟹ q^{*}$ where max distance between $R (q)$ and $C (q)$
Slopes must be equal: $M R (q) = M C (q)$

Visualizing Total Profit As $R (q) - C (q)$

$π (q) = R (q) - C (q)$
Graph: find $q^{*}$ to max $π ⟹ q^{*}$ where max distance between $R (q)$ and $C (q)$
Slopes must be equal: $M R (q) = M C (q)$

At $q^{*} = 5$ :
- $R (q) = 50$
- $C (q) = 40$
- $π (q) = 10$

Visualizing Profit Per Unit As $M R (q)$ and $M C (q)$

At low output $q < q^{*}$ , can increase $π$ by producing more: $M R (q) > M C (q)$

Visualizing Profit Per Unit As $M R (q)$ and $M C (q)$

At high output $q > q^{*}$ , can increase $π$ by producing less: $M R (q) < M C (q)$

Visualizing Profit Per Unit As $M R (q)$ and $M C (q)$

$π$ is maximized where $M R (q) = M C (q)$

Comparative Statics

If Market Price Changes I

Suppose the market price increases
Firm (always setting MR=MC) will respond by producing more

If Market Price Changes II

Suppose the market price decreases
Firm (always setting MR=MC) will respond by producing less

The Firm’s Supply Curve

The firm’s marginal cost curve is its supply curve^‡ $p = M C (q)$
- How it will supply the optimal amount of output in response to the market price
- Firm always sets its price equal to its marginal cost

^‡ Mostly...there is an important exception we will see shortly!

Calculating Profit

Calculating (Average) Profit as AR(q)-AC(q)

Profit is $π (q) = R (q) - C (q)$

Calculating (Average) Profit as AR(q)-AC(q)

Profit is $π (q) = R (q) - C (q)$
Profit per unit can be calculated as: $\begin{aligned} \frac{π (q)}{q} & = A R (q) - A C (q) \\ = p - A C (q) \end{aligned}$

Calculating (Average) Profit as AR(q)-AC(q)

Profit is $π (q) = R (q) - C (q)$
Profit per unit can be calculated as: $\begin{aligned} \frac{π (q)}{q} & = A R (q) - A C (q) \\ = p - A C (q) \end{aligned}$
Multiply by $q$ to get total profit: $π (q) = q [p - A C (q)]$

Calculating (Average) Profit as AR(q)-AC(q)

At market price of p* = $10
At q* = 5 (per unit):
At q* = 5 (totals):

Calculating (Average) Profit as AR(q)-AC(q)

At market price of p* = $10
At q* = 5 (per unit):
- AR(5) = $10/unit
At q* = 5 (totals):
- R(5) = $50

Calculating (Average) Profit as AR(q)-AC(q)

At market price of p* = $10
At q* = 5 (per unit):
- AR(5) = $10/unit
- AC(5) = $7/unit
At q* = 5 (totals):
- R(5) = $50
- C(5) = $35

Calculating (Average) Profit as AR(q)-AC(q)

At market price of p* = $10
At q* = 5 (per unit):
- AR(5) = $10/unit
- AC(5) = $7/unit
- A $π$ (5) = $3/unit
At q* = 5 (totals):
- R(5) = $50
- C(5) = $35
- $π$ = $15

Calculating (Average) Profit as AR(q)-AC(q)

At market price of p* = $2
At q* = 1 (per unit):
At q* = 1 (totals):

Calculating (Average) Profit as AR(q)-AC(q)

At market price of p* = $2
At q* = 1 (per unit):
- AR(1) = $2/unit
At q* = 1 (totals):
- R(1) = $2

Calculating (Average) Profit as AR(q)-AC(q)

At market price of p* = $2
At q* = 1 (per unit):
- AR(1) = $2/unit
- AC(1) = $10/unit
At q* = 1 (totals):
- R(1) = $2
- C(1) = $10

Calculating (Average) Profit as AR(q)-AC(q)

At market price of p* = $2
At q* = 1 (per unit):
- AR(1) = $2/unit
- AC(1) = $10/unit
- A $π$ (1) = -$8/unit
At q* = 1 (totals):
- R(1) = $2
- C(1) = $10
- $π$ (1) = -$8

Short-Run Shut-Down Decisions

What if a firm's profits at $q^{*}$ are negative (i.e. it earns losses)?
Should it produce at all?

Short-Run Shut-Down Decisions

Suppose firm chooses to produce nothing $(q = 0)$ :
If it has fixed costs $(f > 0)$ , its profits are:

$\begin{aligned} π (q) & = p q - C (q) \end{aligned}$

Short-Run Shut-Down Decisions

Suppose firm chooses to produce nothing $(q = 0)$ :
If it has fixed costs $(f > 0)$ , its profits are:

$\begin{aligned} π (q) & = p q - C (q) \\ π (q) & = p q - f - V C (q) \end{aligned}$

Short-Run Shut-Down Decisions

Suppose firm chooses to produce nothing $(q = 0)$ :
If it has fixed costs $(f > 0)$ , its profits are:

$\begin{aligned} π (q) & = p q - C (q) \\ π (q) & = p q - f - V C (q) \\ π (0) & = - f \end{aligned}$

i.e. it (still) pays its fixed costs

Short-Run Shut-Down Decisions

A firm should choose to produce no output $(q = 0)$ only when:

$\begin{aligned} π from producing & < π from not producing \end{aligned}$

Short-Run Shut-Down Decisions

A firm should choose to produce no output $(q = 0)$ only when:

$\begin{aligned} π from producing & < π from not producing \\ π (q) & < - f \end{aligned}$

Short-Run Shut-Down Decisions

A firm should choose to produce no output $(q = 0)$ only when:

$\begin{aligned} π from producing & < π from not producing \\ π (q) & < - f \\ p q - V C (q) - f & < - f \end{aligned}$

Short-Run Shut-Down Decisions

A firm should choose to produce no output $(q = 0)$ only when:

$\begin{aligned} π from producing & < π from not producing \\ π (q) & < - f \\ p q - V C (q) - f & < - f \\ p q - V C (q) & < 0 \end{aligned}$

Short-Run Shut-Down Decisions

A firm should choose to produce no output $(q = 0)$ only when:

$\begin{aligned} π from producing & < π from not producing \\ π (q) & < - f \\ p q - V C (q) - f & < - f \\ p q - V C (q) & < 0 \\ p q & < V C (q) \end{aligned}$

Short-Run Shut-Down Decisions

A firm should choose to produce no output $(q = 0)$ only when:

$\begin{aligned} π from producing & < π from not producing \\ π (q) & < - f \\ p q - V C (q) - f & < - f \\ p q - V C (q) & < 0 \\ p q & < V C (q) \\ p & < A V C (q) \end{aligned}$

Shut down price: firm will shut down production in the short run when $p < A V C (q)$

The Firm’s Short Run Supply Decision

The Firm's Short Run Supply Decision

Firm’s short run supply curve:

{\begin{cases} p = M C (q) & if p \geq A V C \\ q = 0 & If p < A V C \end{cases}

The Firm's Short Run Supply Decision

Firm’s short run supply curve:

{\begin{cases} p = M C (q) & if p \geq A V C \\ q = 0 & If p < A V C \end{cases}

Summary:

1. Choose $q^{*}$ such that $M R (q) = M C (q)$

Summary:

1. Choose $q^{*}$ such that $M R (q) = M C (q)$

2. Profit $π = q [p - A C (q)]$

Summary:

1. Choose $q^{*}$ such that $M R (q) = M C (q)$

2. Profit $π = q [p - A C (q)]$

3. Shut down if $p < A V C (q)$

Summary:

1. Choose $q^{*}$ such that $M R (q) = M C (q)$

2. Profit $π = q [p - A C (q)]$

3. Shut down if $p < A V C (q)$

Firm's short run (inverse) supply:

${\begin{cases} p = M C (q) & if p \geq A V C \\ q = 0 & If p < A V C \end{cases}$

Choosing the Profit-Maximizing Output $q^{*}$ : Example

$\begin{aligned} C (q) & = 0.5 q^{2} \\ M C (q) & = q \end{aligned}$

How many haircuts per day would maximize Bob’s profits?
How much profit will Bob earn per day?
Find Bob’s shut down price.
Write an equation for Bob’s short-run supply curve

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2.5 — Short Run Profit Maximization

ECON 306 • Microeconomic Analysis • Fall 2022

Ryan Safner Associate Professor of Economics safner@hood.edu ryansafner/microF22 microF22.classes.ryansafner.com

Outline

Revenues

Revenues for Firms in Competitive Industries I

Revenues for Firms in Competitive Industries I

Revenues for Firms in Competitive Industries I

Revenues for Firms in Competitive Industries I

Revenues for Firms in Competitive Industries II

Average and Marginal Revenues

Average and Marginal Revenues

Average and Marginal Revenues: Example

Average and Marginal Revenues: Example

Average and Marginal Revenues: Example

Total Revenue, Example: Visualized

Average and Marginal Revenue, Example: Visualized

Profits

Recall: The Firm's Two Problems

Visualizing Total Profit As R(q)−C(q)R(q)−C(q)

Visualizing Total Profit As R(q)−C(q)R(q)−C(q)

Visualizing Total Profit As R(q)−C(q)R(q)−C(q)

Visualizing Total Profit As R(q)−C(q)R(q)−C(q)

Visualizing Total Profit As R(q)−C(q)R(q)−C(q)

Visualizing Profit Per Unit As MR(q)MR(q) and MC(q)MC(q)

Visualizing Profit Per Unit As MR(q)MR(q) and MC(q)MC(q)

Visualizing Profit Per Unit As MR(q)MR(q) and MC(q)MC(q)

Comparative Statics

If Market Price Changes I

If Market Price Changes II

The Firm’s Supply Curve

Calculating Profit

Calculating (Average) Profit as AR(q)-AC(q)

Calculating (Average) Profit as AR(q)-AC(q)

Calculating (Average) Profit as AR(q)-AC(q)

Calculating (Average) Profit as AR(q)-AC(q)

Calculating (Average) Profit as AR(q)-AC(q)

Calculating (Average) Profit as AR(q)-AC(q)

Calculating (Average) Profit as AR(q)-AC(q)

Calculating (Average) Profit as AR(q)-AC(q)

Calculating (Average) Profit as AR(q)-AC(q)

Calculating (Average) Profit as AR(q)-AC(q)

Calculating (Average) Profit as AR(q)-AC(q)

Short-Run Shut-Down Decisions

Short-Run Shut-Down Decisions

Short-Run Shut-Down Decisions

Short-Run Shut-Down Decisions

Short-Run Shut-Down Decisions

Short-Run Shut-Down Decisions

Short-Run Shut-Down Decisions

Short-Run Shut-Down Decisions

Short-Run Shut-Down Decisions

Short-Run Shut-Down Decisions

Short-Run Shut-Down Decisions

The Firm’s Short Run Supply Decision

The Firm’s Short Run Supply Decision

The Firm's Short Run Supply Decision

The Firm's Short Run Supply Decision

The Firm's Short Run Supply Decision

The Firm's Short Run Supply Decision

The Firm's Short Run Supply Decision

The Firm's Short Run Supply Decision

Summary:

Summary:

Summary:

Summary:

Choosing the Profit-Maximizing Output q∗q∗: Example

Outline

Help

2.5 — Short Run Profit Maximization

2.5 — Short Run Profit Maximization

ECON 306 • Microeconomic Analysis • Fall 2022

Ryan Safner Associate Professor of Economics safner@hood.edu ryansafner/microF22 microF22.classes.ryansafner.com

Outline

Revenues

Revenues for Firms in Competitive Industries I

Revenues for Firms in Competitive Industries I

Revenues for Firms in Competitive Industries I

Revenues for Firms in Competitive Industries I

Revenues for Firms in Competitive Industries II

Ryan Safner
Associate Professor of Economics
safner@hood.edu
ryansafner/microF22
microF22.classes.ryansafner.com

Visualizing Total Profit As $R (q) - C (q)$

Visualizing Total Profit As $R (q) - C (q)$

Visualizing Total Profit As $R (q) - C (q)$

Visualizing Total Profit As $R (q) - C (q)$

Visualizing Total Profit As $R (q) - C (q)$

Visualizing Profit Per Unit As $M R (q)$ and $M C (q)$

Visualizing Profit Per Unit As $M R (q)$ and $M C (q)$

Visualizing Profit Per Unit As $M R (q)$ and $M C (q)$

Choosing the Profit-Maximizing Output $q^{*}$ : Example

Ryan Safner
Associate Professor of Economics
safner@hood.edu
ryansafner/microF22
microF22.classes.ryansafner.com

Visualizing Total Profit As $R (q) - C (q)$

Visualizing Total Profit As $R (q) - C (q)$

Visualizing Total Profit As $R (q) - C (q)$

Visualizing Total Profit As $R (q) - C (q)$

Visualizing Total Profit As $R (q) - C (q)$

Visualizing Profit Per Unit As $M R (q)$ and $M C (q)$

Visualizing Profit Per Unit As $M R (q)$ and $M C (q)$

Visualizing Profit Per Unit As $M R (q)$ and $M C (q)$