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Identification of Market Structure – HHI
Herfindahl–Hirschman Index (HHI):
the market shares of the top N companies are first squared and then added.
HHI does not take the possibility of entry into account, nor the elasticity of demand.
The HHI has limited use for estimating the potential profitability of a company or group of companies.
[Practice Problems] An analyst gathered the following market share data for an industry comprised of five companies:
The industry’s three-firm Herfindahl–Hirschmann Index is closest to:
[Solutions] B
The three-firm Herfindahl–Hirschmann Index is 0.352 + 0.252 + 0.202 = 0.225.
Note: (0.35 + 0.25 + 0.20)2 = 0.7569, much higher than 0.225.
76Stackelberg Model in Oligopoly Market:strategy.while the follower earns less.
279Market Structure:and monopoly.:Perfect,competition,capital.differentiation.market.change.
182Identification of Market Structure – HHI:HHI does not take the possibility of entry into account:[PracticeThe three-firm Herfindahl–Hirschmann Index is 0.352 + 0.252 + 0.202 = 0.225.Notemuch higher than 0.225.
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