Mostly summarized from Gregory Mankiw’s Principles of Economics, 5th Ed.

PART 5  Firm Behavior and the Organization of Industry

Chapter 15 of 36  Monopoly

Section 6 of 32

Figure 2 here

Figure 2 – Demand Curves for Competitive and Monopoly Firms

Panel (a) because competitive firms are price takers, they face horizontal demand curves.

Panel (b) because a monopoly firm is the sole producer in its market, it faces the downward-sloping demand curve.

The monopoly must accept a lower price if it wants to sell more output.

The key difference between a competitive firm and a monopoly firm is the monopoly can influence the price of its output.

A competitive firm

· is small relative to the market in which it operates

· has no power to influence the price of its output

· takes the price as given by the market

Because a monopoly is the sole producer in its market it can alter the price of its good by altering the quantity it supplies to the market.

Consider the demand curves the competitive and monopoly firm face.

A competitive firm

· can sell as much or little as it wants at the given market price

· sells a product with many perfect substitutes offered by competitors

· faces a horizontal, perfectly elastic demand curve

A monopoly firm

· is the sole producer in its market

· faces a downward-sloping demand curve

· will sell less or more of its product if it raises the amount of profit

The market demand curve of a monopoly firm shows the combinations of price and quantity available to it.

The monopoly can choose any point on the demand curve by setting

· the quantity of output

· the price charged

However, a monopoly cannot set both quantity of output and price charged.

The goal of a monopoly firm is to find the optimum quantity supplied and price charged that results in the most profit.

… … 

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