Lijesen, Mark G.; Nijkamp, Peter; Rietveld, Piet - In: Journal of Air Transport Management 8 (2002) 3, pp. 189-197
Markets in civil aviation are characterized by large differences in the level of competition, both between time periods as between regions. To measure competition, several indicators are available, such as the number of competitors, the C4-index and the Herfindahl index. We use these measures in...