Industry structure is often measured by computing the Four-Firm Concentration Ratio. Suppose you have an indus

Industry structure is often measured by computing the Four-Firm Concentration Ratio. Suppose you have an industry with 20 firms and the CR is 30%. How would you describe this industry? Suppose the demand for the product rises and pushes up the price for the good. What long-run adjustments would you expect following this change in demand? What does your adjustment process imply about the CR for the industry? Now consider that the industry has 20 firms but the CR for the industry is 80% instead of 30%. How would you describe this industry? What are some reasons why this industry has a high CR while the other industry had a low CR? Is it possible for smaller firms to thrive and profit in such an industry? How? Contrast the effects on market efficiency if the dominating firms use a price leadership model versus a contestable markets model.

Answer:
That is a lengthy question, but basically, if the Concentration ratio is lower than the number of firms, then there will be a period of zealous competition and then the firms above the concentration ratio will fail and their market share will be absorbed by the firms within the concentration ratio.
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