Distinguish between a perfect market and a monopolistic market.
A perfect (perfectly competitive) market and a monopolistic (imperfectly competitive) market differ on several like features:
Feature
Perfect market
Monopolistic market
Number of sellers
Very many sellers, each too small to affect price
One seller (pure monopoly) or few, so the seller has market power
Nature of product
Homogeneous (identical) products
Unique product with no close substitute
Price control
Firm is a price taker; price set by market demand and supply
Firm is a price maker/setter; can influence price
Entry and exit
Free entry and exit into the industry
Barriers to entry (patents, control of raw materials, large capital, law)
Knowledge
Perfect knowledge of market by buyers and sellers
Imperfect knowledge of the market
Demand curve facing the firm
Perfectly elastic (horizontal) at the ruling price
Downward sloping demand curve
Price and output
Lower price, larger output; normal profit in the long run
Higher price, smaller output; can earn abnormal (super-normal) profit in the long run
In short, perfect competition has many sellers of an identical product who are price takers with free entry, while a monopoly has a single price-making seller of a unique product protected by barriers to entry.
A perfect (perfectly competitive) market and a monopolistic (imperfectly competitive) market differ on several like features:
Feature
Perfect market
Monopolistic market
Number of sellers
Very many sellers, each too small to affect price
One seller (pure monopoly) or few, so the seller has market power
Nature of product
Homogeneous (identical) products
Unique product with no close substitute
Price control
Firm is a price taker; price set by market demand and supply
Firm is a price maker/setter; can influence price
Entry and exit
Free entry and exit into the industry
Barriers to entry (patents, control of raw materials, large capital, law)
Knowledge
Perfect knowledge of market by buyers and sellers
Imperfect knowledge of the market
Demand curve facing the firm
Perfectly elastic (horizontal) at the ruling price
Downward sloping demand curve
Price and output
Lower price, larger output; normal profit in the long run
Higher price, smaller output; can earn abnormal (super-normal) profit in the long run
In short, perfect competition has many sellers of an identical product who are price takers with free entry, while a monopoly has a single price-making seller of a unique product protected by barriers to entry.