large enough to influence the market price” (Case, Fair, Oster, 2009). These firms are measured to show what their actual outputs are and this is done by using concentration ratios. Concentration ratios are share of industry output in sales or employment accounted for by the top firms. I will be analyzing the four-firm concentration ratios for the following industries: fluid milk (311511), women's and girl's cut & sew dresses (315233), envelopes (322232), electronic computers (334111). For example, “Concentration…
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