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Local hamburger market are (as percentages of all hamburgers sold): 23 percent, 22 percent, 18 percent, 12 percent, 11 percent, 8 percent, and 6 percent. what is the four-firm concentration ratio of the hamburger

User Morincer
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The top 4 firms have (23 +22 +18 +12)% = 75% of the market.

The 4-firm concentration ratio is 0.75 or 75%.
User Ion Aalbers
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