00458pamaa2200157 4500 0000037525 20080728090000.0 0840331894 (pbk) 338.5 ORR HB172 ORR 1984 Orr Principles of microeconomics : theory and cases John A. Orr, Frederica Shockley. Iowa: Kendall/Hunt, 1984. viii, 279p.: ill.; 24 cm. Microeconomics Shockley, Frederica