Embedded Files
--1.5.1 NATURE/MEANING OF THE PPC--
--1.5.1 NATURE/MEANING OF THE PPC--
--1.5.2 PPC: CONSTANT vs INCREASING OPP. COST--
--1.5.2 PPC: CONSTANT vs INCREASING OPP. COST--
--1.5.3 SHIFTS IN THE PPC: CAUSES--
--1.5.3 SHIFTS IN THE PPC: CAUSES--
--1.5.4 POSITIONS WITHIN THE PPC--
--1.5.4 POSITIONS WITHIN THE PPC--
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