Multiple Choice QuestionWhich statement is true about an industry and the Herfindahl index?Multiple choice question.The higher the index, the more likely an industry is monopolistically competitive.The lower the index, the more likely an industry is oligopolistic.The lower the index, the more likely the industry is monopolistically competitive.The higher the index, the more likely the industry is purely competitive.

The Herfindahl index is a measure of the size of firms in relation to the industry and an indicator of the amount of competition among them. It is calculated by squaring the market share of each firm competing in the market and then summing the resulting numbers.

Here are the explanations for each choice:

1. "The higher the index, the more likely an industry is monopolistically competitive." - This statement is incorrect. A higher Herfindahl index indicates a higher level of market concentration, which is more characteristic of a monopoly or an oligopoly, not monopolistic competition.

2. "The lower the index, the more likely an industry is oligopolistic." - This statement is incorrect. A lower Herfindahl index indicates a lower level of market concentration, which is more characteristic of monopolistic competition or perfect competition, not an oligopoly.

3. "The lower the index, the more likely the industry is monopolistically competitive." - This statement is correct. A lower Herfindahl index indicates a lower level of market concentration, which is more characteristic of monopolistic competition where there are many firms, each of which has a small market share.

4. "The higher the index, the more likely the industry is purely competitive." - This statement is incorrect. A higher Herfindahl index indicates a higher level of market concentration, which is more characteristic of a monopoly or an oligopoly, not perfect competition.

So, the correct answer is: "The lower the index, the more likely the industry is monopolistically competitive."