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5.2.2决定市场结构的因素一场集中度 2R,=∑X/∑ HH=∑(X,/X)2=∑S2 C4值(%) C8值(%) 寡占1 More than 75 寡占2 75,85) More than 85 寡占3 (50,85) (75,85) 寡占4 (35,50) (45,75) 寡占5 (3035) (4045) 竞争型 Less than 30 Less than 405.2.2 决定市场结构的因素 —市场集中度 = = = N i i n i CRn Xi X 1 1   = = = = n i i n i HHI Xi X S 1 2 2 1 ( ) C4值(%) C8值(%) 寡占1 More than 75 ——— 寡占2 (75, 85) More than 85 寡占3 (50, 85) (75, 85) 寡占4 (35, 50) (45,75) 寡占5 (30,35) (40,45) 竞争型 Less than 30 Less than 40
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