a). Assume an industry dominated by a single large firm which controls 50% of the market. The remaining 50% of the market is controlled by ten firms each with a 5% market share. What is the 4-firm concentration ratio?

a.80% b.70 % c.100% d.65%

b). Assume an industry dominated by a single large firm which controls 50% of the market. The remaining 50% of the market is controlled by ten firms each with a 5% market share. What is the HHI?

a.3755 b.2575 c.1000 d.2750

Answer for part a and b