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Title: Could transport costs be lower?: the use of a variance screen to evaluate competition in the petrol market in Spain
Authors: Jiménez González, Juan Luis 
Perdiguero García, Jordi
UNESCO Clasification: 531212 Transportes y comunicaciones
531205 Energía
Issue Date: 2011
Journal: International Journal of Transport Economics 
Abstract: Petrol is an important factor not only in transport costs but also in household consumption. However, some doubts exist as to the level of competition in the worldwide retail petrol market. The international petrol market at the retail level has been studied from different perspectives in the economic literature, but studies of the issue in Spain are much more recent. This paper analyses prices in the market assuming that in noncompetitive markets prices are higher and the variation coefficient is lower. We use weekly retail petrol (petrol 95 and diesel) price data from the ten biggest cities in Spain to employ a variance screen to detect suspicious behaviour in retailing. We conclude that this market shows low price dispersion, regardless of brand or city. However, this symmetrical behavior in prices among all petrol stations does not enable us to reach any robust conclusions as to the existence of collusive behaviour in the Spanish petrol market.
ISSN: 0303-5247
Source: International Journal of Transport Economics [ISSN 0303-5247], v. 38 (3), p. 265-283
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