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a) The HHI index of the industry is calculated using the formula
HHI = s12 + s22 + s32 + ... + sn2 (where s1,s2,s3,…sn is the market share of the ith firm).
In this industry,
HHI = 32+102+102+102+102+102+102+172+202 =9+100+100+100+100+100+100+289+400 = 1298...
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