40. If the four-firm concentration ratio for industry X is 80, A. the four largest firms account for 80 percent of total sales. B. each of the four largest firms accounts for 20 percent of total sales. C. the four largest firms account for 20 percent of total sales. D. the industry is monopolistically competitive.单项选择题

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8.    The Herfindahl index is: A.    the sum of the squared percentage market shares of all firms in the industry. B.    the sum of the market shares for the top 10 firms in the industry. C.    a measure of product differentiation in the market. D.    a measure of how easy it is for new firms to enter the market. 

A high Four-Firm Concentration Ratio (CR4), such as 80%, indicates:

Part 1​'The commercial banking industry in Canada is less competitive than the commercial banking industry in the United States because in Canada only a few large banks dominate the​ industry, while in the United States there are around​ 6,500 commercial​ banks.' Is this statement true or​ false? Explain your answer.Part 2 A. True. The reason for the large number of US banks is regulations that promote competition such as branching restrictions B. False. The reason for the large number of US banks is anticompetitive regulations such as branching restrictions C. True. The banking industry is less competitive in Canada than in the United States because Canada has a national banking​ system, i.e., owned and operated by the government D. False. It is not true that the industry is dominated by a few large​ firms; thus, based on the​ Herfindahl-Hirschman Index, the banking industry in Canada is just as competitive as in the United States

Which of the following statements is NOT correct?

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