“…The choice of tax instrument and tax level has an impact on market prices, profits, the extent of competition and welfare (Anderson et al, 2001, Choné et al, 2002, Borsenberger et al, 2010, Jaag and Trinkner, 2010. In this paper, we compare a series of tax instruments including an output tax, a revenue tax, an entry fee, a tax on covered routes and a pay-or-play.…”