By calculating a concentration ratio, economists measure the Question 9 options: degree to which a monopolist's output is lower than in perfect competition. fraction of total industry sales accounted for by the largest firms. degree to which firms in the industry use similar technologies. concentration of firms in one geographic location. control of a monopolist over its input prices.Which of the following Market structures can be best explained by "there are many small firms, but each firm has some degree of market power." Question 10 options: Perfect Competition Monopoly Oligopoly Monopolistic Competition