supplier by switching production facilities to producing the monopolized collection of products, the increased level of supply may render any attempted price increase unprofitable. In this case, those producers with the ability for supply-side substitution should be included in the relevant market. Geographic market The geographic market is an area in which the conditions of competition applying to the product concerned are the same for all traders. The same factors used in delineating relevant product markets should be used to define the relevant geographic market. The elements to be taken into consideration when defining the relevant geographic market include the nature and characteristics of the concerned products, the existence of entry barriers, consumer preferences, differences among the market shares of undertakings in the neighboring geographic areas, as well as significant differences between suppliers’ prices and transport costs level. An interesting aspect to which competition authorities look at are transport costs, given that high transport costs may explain why trade between two regions is economically infeasible. See also Competition law European Commission European Court of Justice United Brands Company v Commission of the European Communities Federal Trade Commission Anti-trust law United States Department of Justice Antitrust Division Industrial organization SSNIP References Bibliography Bellamy, C. W. and G. D. Child (1993): Common Market Law of Competition. London, Sweet and Maxwell. Bishop, Simon and Mike Walker (1999): The Economics of EC Competition Law. Sweet and Maxwell. Bishop, Simon and M. Darcey (1995): A Relevant Market Is Something Worth Monopolising. Unpublished Mimeo. Competition law