In economics, a market is any system where buyers and sellers exchange goods and services. Markets are grouped by the number of sellers, the type of product and the freedom of entry. Knowing these market structures helps in answering economy questions in exams.
Perfect Competition
- Large number of buyers and sellers.
- Products are homogeneous (identical).
- Free entry and exit of firms.
- Firms are price takers; a single price prevails.
- It is mostly a theoretical or ideal market.
Monopoly
- Only one seller controls the entire market.
- No close substitutes for the product.
- The seller is a price maker.
- High barriers to entry. Example: Indian Railways (largely).
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Monopolistic Competition
- Many sellers selling slightly different (differentiated) products.
- Heavy use of branding and advertising.
- Each firm has some control over its price.
- Examples: toothpaste, soap, cold drinks.
Oligopoly
- A few large sellers dominate the market.
- Firms are interdependent; one firm's price affects others.
- May involve price agreements (cartels).
- Examples: telecom, cement, automobiles.
- Duopoly is a special case with only two sellers.
Quick Revision Points
- Perfect competition: many sellers, identical goods, price takers.
- Monopoly: single seller, price maker.
- Monopolistic competition: many sellers, differentiated goods, branding.
- Oligopoly: few sellers, interdependent.
- Duopoly: only two sellers.
- Monopoly on the buyer side is called monopsony.
- Real markets are mostly monopolistic competition or oligopoly.