00387nam a2200097Ia 4500008004100000050002300041100002100064245005600085247007600141264007200217230508s2012    xx            000 0 und d  aHB 1671.5 A76 20121 aArnold, Roger A.10aPrinciples of economics 10th ed /cArnold, Roger A.  aPrinciples of economics 10th ed_HB 1671.5 A76 2012_Arnold, Roger A_2012  a[Place of publication not identified] : bCengage Learning, c2012.