Monopoly
A monopoly is a market structure in which a single seller controls the entire supply of a product with no close substitutes. Unlike firms in perfect competition, a monopolist faces the entire downward-sloping market demand curve and therefore has price-making power.
Why Monopolies Exist: Barriers to Entry
Monopolies persist because barriers prevent competitors from entering:
| Barrier type | Example |
|---|---|
| Legal / patent | Drug companies under patent protection; utilities with government franchise |
| Natural monopoly | Single firm can serve the market at lower cost than multiple firms (railways, pipelines) |
| Control of key resource | De Beers' historical control of diamond supply |
| Network effects | Dominant platforms where value grows with users (early-stage monopolies) |
| Economies of scale | Cost per unit falls as output rises, making it impossible for small entrants to compete on price |
Profit Maximization
A monopolist maximizes profit by producing where Marginal Revenue (MR) = Marginal Cost (MC), then setting the price from the demand curve at that quantity.
Key relationships:
- MR lies below the demand curve (because to sell one more unit, the monopolist must lower price on all units)
- The monopolist charges P > MC — there is a markup above marginal cost
- This markup is the source of monopoly profit
Deadweight Loss
The monopoly price (PM) is higher and quantity (QM) is lower than the socially optimal price and quantity under perfect competition (PC, QC). The difference creates a deadweight loss — value that is lost to both the producer and consumers but gained by nobody.
This deadweight loss is why economists consider monopoly inefficient from society's perspective.
Price Discrimination
A monopolist may charge different prices to different buyers based on willingness to pay:
- First-degree (perfect): Different price for each unit sold (e.g., negotiated contracts, auctions)
- Second-degree: Different prices for different quantities (bulk discounts)
- Third-degree: Different prices for different market segments (student discounts, cinema pricing, peak vs. off-peak)
Price discrimination increases the monopolist's profit but may improve or worsen consumer welfare depending on the case.
Natural Monopoly and Regulation
A natural monopoly occurs when one firm can serve the entire market at lower average cost than two or more firms. Classic examples: electricity distribution, water supply, rail infrastructure.
Governments typically respond with:
- Price regulation: Require the natural monopoly to set price at average cost (break-even) or marginal cost
- Public ownership: Government runs the utility directly
- Franchise bidding: Companies bid for the exclusive right to serve the market
Indian Context
India has several regulated monopolies or near-monopolies:
- Indian Railways — state-owned monopoly in passenger rail (freight is partially open)
- BPCL, HPCL, IOC — historically dominant in petroleum retail (market being opened)
- Telecom sector — moved from near-monopoly (BSNL) to oligopoly after liberalization