Economics · Ch 5 — Theory of Value
Market Forms: Meaning and Classification
Market Forms: Meaning and Classification
In everyday language a market is a place where goods are bought and sold, but in economics a market has a wider meaning — it is any arrangement that brings buyers and sellers of a commodity into contact, whether or not they meet physically. A national stock exchange, a village vegetable market and an online retail platform are all "markets" in this sense, because in each of them price is determined by the interaction of demand and supply.
Economists classify markets on the basis of several criteria: the number of sellers and buyers, the nature of the product (homogeneous or differentiated), the ease of entry and exit for new firms, and the degree of control an individual seller has over price. On these criteria, the Theory of Value studies four broad market forms.
| Market form | Number of sellers | Nature of product | Entry/exit | Control over price |
|---|---|---|---|---|
| Perfect competition | Very large | Homogeneous | Free | None — price taker |
| Monopoly | One | No close substitute | Blocked | Full — price maker |
| Monopolistic competition | Large | Differentiated (branded) | Free | Limited |
| Oligopoly | Few | Homogeneous or differentiated | Restricted | Interdependent |
For a student following the Andhra Pradesh Intermediate Economics syllabus, this table is the map for the rest of the unit: every price-determination model that follows is really just an answer to the question "what happens to price and output when the number of sellers and the freedom of entry change?"
Any arrangement, physical or virtual, that brings buyers and sellers of a commodity into contact so that price can be determined by demand and supply.
A product where every unit is identical in the buyer's eyes, so no buyer prefers one seller's output over another's purely on quality or branding.