00384nam a2200145   45000010005000000030003000050050017000080080041000250350018000660350017000840500024001011000022001252450067001472600024002148620UR20220428113600.0061102|||||||||||||||||||||||||||||||| d  a(janium) 8609  a(janium)8609 4aHD2757.2b.T73 19971 aTrain, Kenneth E.10aOptimal regulationb : the economic theory of natural monopoly  bThe Mit pressc1997