1.3 Competition and Market Structures

The Competitive Landscape

Market structures describe how competitive an industry is, based on the number of sellers, control over price, ease of barriers to entry, and product similarity. The four main types are perfect competition, monopolistic competition, oligopoly, and monopoly. More competition generally means lower prices and more choices for consumers; less competition means firms have more pricing power.

Perfect Competition vs. Monopoly

Perfect competition has many small sellers, identical products, and no barriers to entry — no single firm sets price (think farmers' markets). A monopoly is the opposite: one seller controls an entire market with high barriers to entry (like patents or huge startup costs), giving it full control over price, as in a local utility company.

Monopolistic Competition and Oligopoly

Monopolistic competition features many sellers with differentiated products (restaurants, clothing brands), giving firms some price control through branding. An oligopoly has a few large firms dominating a market (airlines, cell carriers) with high barriers to entry; firms are interdependent, so one's pricing decisions strongly affect competitors.

Key terms

Market structure

A classification of an industry based on the number of sellers, price control, and barriers to entry.

Perfect competition

Many small sellers, identical products, no price control, easy entry (e.g., agricultural markets).

Monopoly

One seller dominates the market with high barriers to entry and full price control.

Oligopoly

A few large, interdependent firms dominate the market with high barriers to entry (e.g., airlines).

Barriers to entry

Obstacles like high startup costs, patents, or regulations that make it hard for new firms to enter a market.

Try an AP-style question

In perfect competition, firms…

1. face strong barriers to entry
2. set prices freely without limits
3. sell very different branded goods
4. sell identical products and take the price