00414nam a2200145   45000010005000000030003000050050017000080080041000250350018000660350017000840500022001011000017001232450104001402600024002448581UR20220428113542.0061102|||||||||||||||||||||||||||||||| d  a(janium) 8570  a(janium)8570 4aHD2326b.S88 19911 aSutton, John10aSunk cost and market structureb : price competition advertising and the evolution of concentration  bThe Mit pressc1991