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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.
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