Barrier to entry ditinjau dari Pasal 19 Undang-undang Nomor 5 tahun 1999 terkait konsep rule of reason dalam Putusan KPPU tentang jasa pelayanan taksi di Bandara Hasanudin (Nomor 18/KPPU-I/2009) dan di Bandara Juanda Surabaya (Nomor 20/KPPU-I/2009 = Barrier to entry in terms of Article 19 of Law No. 5 of 1999 related to concepts rule of reason in the commission's decision about taxi services in Hasanuddin Airport (Number 18/KPPU-I/2009) and in Surabaya Juanda Airport (Number 20/KPPU-I/2009)/ Mohammad Gadmon Kaisar - Mohammad Gadmon Kaisar, author (2013)