Which of the Following Is Not a Shortcoming of the Concentration

Multiple Choice

Which of the following is not a shortcoming of the concentration ratio as a measure of the extent of competition in an industry?

A) Concentration ratios do not include sales in the United States by foreign firms.
B) Concentration ratios are calculated for the national market, even though the competition in some industries is mainly local.
C) Concentration ratios assign weights to only the four largest firms in an industry.
D) Concentration ratios do not address the fact that competition sometimes exists between firms in different industries.