Which of the following measures market structure?

Question

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All three of the listed measures - the four-firm concentration ratio, Lerner Index, and Herfindahl-Hirschman Index - may be used to make inferences about market structure. The four-firm concentration ratio measures the market share of the four largest firms in a market, which can indicate how competitive or concentrated the market is. The Lerner Index measures the difference between price and marginal cost as a percentage of price, which can indicate the degree of market power held by the firms in the market. The Herfindahl-Hirschman Index measures the sum of squared market shares of all firms in a market, which can indicate whether the market is highly concentrated or more competitive, as well as provide information for antitrust authorities assessing mergers and acquisitions.

Which of the Following Measures Market Structure