Chapter 9
Chapter 9. Perfect Competition and Monopoly
Topics to be Discussed
Profit Maximization
Marginal Revenue, Marginal Cost, and Profit Maximization
Choosing Output in the Short Run / Long Run
Perfectly Competitive Markets
Introduction
Characteristics of Perfectly Competitive Markets
1) Identical products
2) Individual firms are too small to impact the market
No barriers to entry and exit
Marginal Revenue, Marginal Cost, and Profit Maximization
Determining the profit maximizing level of output
Profit = Total Revenue - Total Cost
Total Revenue (R) = Pq
Total Cost (C) = Cq
Profit Maximization in the Short Run
[pic]
Marginal Revenue, Marginal Cost, and Profit Maximization
Observations
R(q)
R(q) slope = marginal revenue
C(q)
C(q) slope = marginal cost
Marginal revenue is the additional revenue from producing one more unit of output.
Marginal cost is the additional cost from producing one more unit of output.
Comparing R(q) and C(q)
MR > MC
Indicates higher profit at higher output
Marginal Revenue, Marginal Cost, and Profit Maximization
Comparing R(q) and C(q)
Output levels
MR = MC
Therefore, it can be said:
Profits are maximized when MC = MR.
[pic]
The Competitive Firm : Price Taker
A) The competitive firm’s demand
Individual producer sells all units for $4 regardless of the producer’s level of output.
If the producer tries to raise price, sales are zero.
If the producers tries to lower price he cannot increase sales
P = D = MR = AR
B) The competitive firm’s Profit Maximization
MC(q) = MR = P
[pic]
[pic]
[pic]
Summary of Production Decisions
[pic]
5. A competitive firm’s short run supply curve is MC above AVC
The Short-Run Market Supply Curve
Producer Surplus in the Short Run
Firms earn a surplus on all but the last unit of output.
The producer surplus is the sum over all units produced of the difference between the market price of the good and the marginal cost of production.
The consumer surplus is the sum over all units produced of the difference between the market price of the good and the marginal cost of production.
[pic]
DEADWEIGHT LOSS ?
Monopoly
1) One seller
2) One product (no good substitutes)
3) Barriers to entry
The monopolist is the supply-side of the market and has complete control over the amount offered for sale.
Profits will be maximized at the level of output where marginal revenue equals marginal cost.
Observations
1) To increase sales the price must fall
2) MR < P
3) Compared to perfect competition
No change in price to change sales
MR = P
Monopolist’s Output Decision
1) Profits maximized at the output level where MR = MC
Cost functions are the same
A Rule of Thumb for Pricing
We want to translate the condition that marginal revenue should equal marginal cost into a rule of thumb that can be more easily applied in practice.
[pic] : This equation is familiar, isn’t it?
How does the price set by a monopolist compare with the price under competitive market?
We saw that P=MC in a competitive market. A monopolist charges a price that exceeds marginal cost, but by an amount that depends inversely on the E.
If demand is very elastic, there is little benefit to being a monopolist. [WHY ?????]
REMEMBER THIS
For the competitive market, price equals to marginal cost; for the firm with monopoly power, price exceeds marginal cost.
Therefore the national way to measure monopoly power is to examine the extent to which the profit-maximizing price exceeds marginal cost. The measure of monopoly power is called the Lerner Index of Monopoly Power
L = (P-MC) / P
The larger L, the greater the degree of monopoly power.
Sources of Monopoly Power
E
The Number of Firms ( Monopolistic Competition Case)
Interaction among Firms.
QUESTION 1.
A firm has two factories, for which costs are given by
Factory #1 : C1 = 10Q12
Factory #2 : C2 = 20Q22
The firm faces the following demand curve
P=700-5Q
Where Q is total output Q=Q1+Q2
1. On a diagram, draw the MC, AR, MR curves for two factories, and the total marginal cost curve (i.e., the marginal cost of producing Q (i.e., Q=Q1+Q2)
2. Indicate the profit-maximizing output for each factory.
3. Calculate the values of Q1, Q2 and P, that maximize profit.
QUESTION 2.
A monopolist faces the demand curve P=11 -- Q , where P is measured in dollars per unit and Q in thousands of units. The monopolist has a constant average cost of $6 per unit.
1. On a diagram, draw the AR, MR, AC and MC curves. What are the monopolist’s profit-maximizing price and quantity, and what is the resulting profit?
2. Calculate the firm’s degree of monopoly power using the Lerner Index.
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