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| | Perfect Competition Equals Monopoly |
 | | Since marginal cost is derived from marginal product, the equivalence of monopoly and perfectly competitive aggregate marginal cost curves requires that the marginal products are also identical (assuming, as economists do, that both a monopoly and the competitive industry face a competitive market for their inputs). |
 | | In words, this equation says that (assuming, without loss of generality, that all competitive firms are the same size) that the output of n competitive firms, each employing x workers, must be identical to the output of a single monopoly employing nx workers, for all values of n and x in the relevant range. |
 | | If economists want to be able to say that perfect competition is 'good' and monopoly 'bad', one of the conditions required to be definitive about this--that marginal cost curves are identical--means that their model collapses. |
| www.debunking-economics.com /Maths/pc_v_monopoly.htm (846 words) |
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