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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Market concentration ： ウィキペディア英語版 Market concentration In economics, market concentration is a function of the number of firms and their respective shares of the total production (alternatively, total capacity or total reserves) in a market. Alternative terms are Industry concentration and Seller concentration.〔( ''Concentration'' ). Glossary of Statistical Terms. Organisation for Economic Co-operation and Development.〕 Market concentration is related to ''industrial concentration'', which concerns the distribution of production within an industry, as opposed to a market. In industrial organization, market concentration may be used as a measure of competition, theorized to be positively related to the rate of profit in the industry, for example in the work of Joe S. Bain. ==Metrics== Commonly used market concentration measures are the Herfindahl index (HHI or simply H) and the concentration ratio (CR).〔J. Gregory Sidak, Evaluating Market Power Using Competitive Benchmark Prices Instead of the Hirschman-Herfindahl Index, 74 ANTITRUST L.J. 387, 387-388 (2007).〕 The Hannah-Kay (1971) index has the general form :$\backslash text\_\backslash alpha(x)\; =$ \begin & \left(\sum s_i^\alpha\right)^\frac \text\alpha > 0, \alpha \ne 1 \\ & \prod s_i^ \text\alpha = 1\\ \end. Note, $\backslash prod\; s\_i^\; =\; \backslash exp\backslash left(\backslash sum\; s\_i\; \backslash log(s\_i)\backslash right)$, which is the exponential index. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Market concentration」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.