The four-firm concentration ratio for audio equipment makers...

The four-firm concentration ratio for audio equipment makers is 30 and for electric lamp makers it is $89 .$ The HHI for audio equipment makers is 415 and for electric lamp makers it is $2,850 .$ Which of these markets is an example of monopolistic competition?

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Key Concepts

Concentration Ratio

This metric measures the total market share held by the top firms in an industry. A lower concentration ratio indicates a more competitive market with no single firm or few firms dominating, while a higher ratio suggests greater market concentration and potential oligopoly characteristics.

Herfindahl-Hirschman Index (HHI)

The HHI is calculated by summing the squares of the market shares of all firms in an industry, providing a more sensitive measure of market concentration than the concentration ratio. A lower HHI signals a more competitive market structure, whereas a higher HHI points toward significant market power and less competition.

Monopolistic Competition

This market structure is characterized by many firms that sell products which are differentiated from one another. Although each firm holds some market power to set prices due to product differentiation, the presence of many competitors keeps the overall market competitive.

Oligopoly

An oligopoly is a market structure dominated by a few large firms. In such markets, each firm holds significant market power, and the strategic interactions among these firms can lead to limited competition and potentially higher prices for consumers.

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