Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2016-04-25T20:29:03Z No. of bitstreams: 1 LeonardoGevezierBraga_DISSERT.pdf: 641257 bytes, checksum: 9ac37a1f5bff2cba8c95c5c34ebe5305 (MD5) / Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2016-04-26T23:02:20Z (GMT) No. of bitstreams: 1 LeonardoGevezierBraga_DISSERT.pdf: 641257 bytes, checksum: 9ac37a1f5bff2cba8c95c5c34ebe5305 (MD5) / Made available in DSpace on 2016-04-26T23:02:20Z (GMT). No. of bitstreams: 1 LeonardoGevezierBraga_DISSERT.pdf: 641257 bytes, checksum: 9ac37a1f5bff2cba8c95c5c34ebe5305 (MD5) Previous issue date: 2014-10-24 / Este trabalho tem como objetivo analisar a competi??o entre postos de gasolina no Estado do Rio Grande do Norte. Para tanto, investiga-se a rela??o entre o pre?o m?dio da gasolina e a concentra??o de postos nos mercados (munic?pios) do estado do Rio Grande do Norte. Faz-se uso de uma ferramenta pouco aplicada para o mercado brasileiro que ? o modelo econom?trico espacial. Foi utilizada uma base que cont?m dados de todos os postos das principais cidades do estado do Rio Grande do Norte e inclui 142 observa??es referentes a postos. Modelos te?ricos predizem a rela??o entre o n?mero de competidores num mercado e o pre?o m?dio; estes modelos te?ricos compreendem: os de competi??o monopol?stica de Perloff e Salop (1985), e os de search-theoretic, de Carlson e McAfee (1983) e de Varian (1980). Os resultados emp?ricos mostraram que uma maior densidade dentro de um espa?o geogr?fico est? associada a um pre?o m?dio mais baixo, convergindo assim, com o modelo de competi??o monopol?stica e com o search-theoretic de Carlson e McAfee (1983). Os par?metros estimados pouco variaram com inclus?o/exclus?o de vari?veis controles, mostrando a robustez dos mesmos. / This study aims to analyze the relationship between average price with the concentration in the markets (municipalities) in the state of Rio Grande do Norte, is using a little tool applied to the Brazilian market is the spatial econometric model. A data base contains all the stations of the major cities in the state of Rio Grande do Norte and includes 142 observations on stations was used. Theoretical models predict the relationship between the number of competitors in a market and the average price; these theoretical models include: the monopolistic competition of Perloff and Salop (1985), and the search-theoretic, of Carlson and McAfee (1983) and Varian (1980). The empirical results showed that a higher density within a geographic area is associated with a lower average price, thus converging with the monopolistic competition model and with the search-theoretic of Carlson and McAfee (1983). The parameters varied little with the inclusion / exclusion of control variables, showing the robustness of them.