Suppose That There Are Two Industries,A and B

Multiple Choice

Suppose that there are two industries,A and B. There are five firms in industry A with sales at $5 million, $2 million, $1 million, $1 million, and $1 million, respectively. There are four firms in industry B with equal sales of $2.5 million for each firm. The four-firm concentration ratio for industry A is:

A) 0.9.
B) 1.0.
C) 0.8.
D) 0.7.