{"title":"Opoly号码","authors":"Michael Poulshock","doi":"10.2139/ssrn.3495139","DOIUrl":null,"url":null,"abstract":"We propose a slight modification to the Herfindahl-Herschman Index of market concentration, resulting in a formula that indicates the number of firms dominating a market. We call this metric the opoly number because it has a value of 1 for a monopoly, 2 for a duopoly, etc.","PeriodicalId":142139,"journal":{"name":"ERN: Monopoly","volume":"8 1","pages":"0"},"PeriodicalIF":0.0000,"publicationDate":"2019-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"The Opoly Number\",\"authors\":\"Michael Poulshock\",\"doi\":\"10.2139/ssrn.3495139\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"We propose a slight modification to the Herfindahl-Herschman Index of market concentration, resulting in a formula that indicates the number of firms dominating a market. We call this metric the opoly number because it has a value of 1 for a monopoly, 2 for a duopoly, etc.\",\"PeriodicalId\":142139,\"journal\":{\"name\":\"ERN: Monopoly\",\"volume\":\"8 1\",\"pages\":\"0\"},\"PeriodicalIF\":0.0000,\"publicationDate\":\"2019-11-28\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"ERN: Monopoly\",\"FirstCategoryId\":\"1085\",\"ListUrlMain\":\"https://doi.org/10.2139/ssrn.3495139\",\"RegionNum\":0,\"RegionCategory\":null,\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"\",\"JCRName\":\"\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"ERN: Monopoly","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.2139/ssrn.3495139","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
We propose a slight modification to the Herfindahl-Herschman Index of market concentration, resulting in a formula that indicates the number of firms dominating a market. We call this metric the opoly number because it has a value of 1 for a monopoly, 2 for a duopoly, etc.
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