00297nam a2200109 a 450000500170000002000150001708200130003210000370004524500630008226000220014530000200016720251203091724.0  a0198772238  a338bHAY  aHay, Donald A., Morris, Derek J.  aIndustrial economics and organization: Theory and evidence  aOxfordbOUPc1991  axiii,686p, 24cm