Answer:
4-Firm Concentration ratio = 20%
Explanation:
Each firm has equal share
That means 100% share of the industry is divided equally among the 20 firm
Share of 1 firm = 100/20 = 5%
4-Firm Concentration ratio = Share of 1 firm * Number of firm
4-Firm Concentration ratio = 0.05 * 4
4-Firm Concentration ratio = 0.2
4-Firm Concentration ratio = 20%
