In the market for batteries, the four largest firms earn 90% of the total revenue and there are 35 firms in the industry. This industry is best described as

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An oligopoly is a market structure in which a few large firms dominate the industry and control the majority of the market share. The fact that the four largest firms earn 90% of the revenue in the battery market suggests that it is highly concentrated and therefore best described as an oligopoly.

In the Market for Batteries, the Four Largest Firms Earn