Ten firms compete in a market to sell product X. The total...

Ten firms compete in a market to sell product $X$. The total sales of all firms selling the product are $$\$ 1$$ million. Ranking the firms' sales from highest to lowest, we find the top four firms' sales to be $$\$ 175,000$$, $$\$ 150,000$$, $$\$ 125,000$$, and $$\$ 100,000$$, respectively. Calculate the four-firm concentration ratio in the market for product $X$.

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Key Concepts

Market Share

Market share refers to the percentage of total sales or revenue in a market attributable to a single firm or a group of firms. It is a fundamental concept in analyzing competitive strength and market dominance, helping to understand how well a firm or group of firms is performing relative to the overall market.

Concentration Ratio

The concentration ratio is a measure of the extent to which a relatively small number of firms dominate total sales in a market. It provides insight into market structure and the degree of competition, with higher ratios indicating less competitive conditions and more concentrated markets.

Four-firm Concentration Ratio

The four-firm concentration ratio specifically calculates the combined market share of the four largest firms in an industry. It is used to assess how much of the total market sales are controlled by the top firms, providing an indication of potential oligopoly, where a small number of firms exercise significant market power.

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