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AP® Microeconomics

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Moderate

Four-Firm Concentration Ratio Problem

APMICR-BA3B6X

The table below presents the annual revenue of all the manufacturers within the same industry.

What is the four-firm concentration ratio of the industry?

Manufacturer Millions of dollars
Firm A 125
Firm B 250
Firm C 175
Firm D 200
Firm E 150
Firm F 100
A

775

B

100

C

75

D

77.5

E

750