{"title":"EX-POST EVALUATION OF MEAN-VARIANCE CARTEL FILTERS","authors":"Matheus Humberto Migliari Ramalho, E. Ribeiro","doi":"10.1590/198055272622","DOIUrl":null,"url":null,"abstract":"ABSTRACT This study provides an ex-post evaluation of selected filters to find cartels. We evaluate whether filters incurred in type I errors, i.e., failing to recognize the presence of a cartel. We use seven cartel cases in the retail fuel sector in Brazil, for which detailed local price and gross retail margins are available. Cartel cases provided 14 fuel-location events. The evaluated methods include GARCH-based and structural break methods from the international literature and three filters associated with Brazilian antitrust and regulation authorities (ANP, SBDC, and local correlation). All methods are based on an analytical framework which considers cartels as periods of higher average prices (margins) and lower price (margin) variance. Our results indicate that our filters failed to correctly signal most fuel-location cartel events, even using endogenous model-based price changes dates. The problems filters show of detecting actual cartels may be due to difficulties dating cartels or the possibly inappropriate use of price mean-variance markers to evaluate cartel behavior.","PeriodicalId":39928,"journal":{"name":"Revista de Economia Contemporanea","volume":"1 1","pages":""},"PeriodicalIF":0.0000,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"1","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Revista de Economia Contemporanea","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1590/198055272622","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q4","JCRName":"Economics, Econometrics and Finance","Score":null,"Total":0}
引用次数: 1
Abstract
ABSTRACT This study provides an ex-post evaluation of selected filters to find cartels. We evaluate whether filters incurred in type I errors, i.e., failing to recognize the presence of a cartel. We use seven cartel cases in the retail fuel sector in Brazil, for which detailed local price and gross retail margins are available. Cartel cases provided 14 fuel-location events. The evaluated methods include GARCH-based and structural break methods from the international literature and three filters associated with Brazilian antitrust and regulation authorities (ANP, SBDC, and local correlation). All methods are based on an analytical framework which considers cartels as periods of higher average prices (margins) and lower price (margin) variance. Our results indicate that our filters failed to correctly signal most fuel-location cartel events, even using endogenous model-based price changes dates. The problems filters show of detecting actual cartels may be due to difficulties dating cartels or the possibly inappropriate use of price mean-variance markers to evaluate cartel behavior.
期刊介绍：
Revista de Economia Contemporânea to publish original contributions in Economic Theory, Applied Economy, Economic History, History of Economic Thought, Economic Methodology and other pertinent economic matters. Abstract: Brief abstract - The Revista de Economia Contemporânea (REC) began publication in the second half of 1997 in the Economy Institute of the Federal University of Rio de Janeiro. Its articles strive to contribute to the academic debate among the various areas of interest in economics. On account of its self-criticism and debating tradition, the magazine wishes to be plural and open to dialogue with the present-day different theoretical tendencies in the expanding doctrine of economics.
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