Ah, these tricky elasticity questions, baba! Students often confuse price elasticity with slope of the demand curve, forgetting it's about percentage change. Opportunity cost on the PPC? They pick the obvious sacrificed good, but miss the *quantity* of it given up, which is the real cost. My life is that PPC diagram—every rupee for postal charges to Pune is a sholapith flower I cannot make, a very precise, stubborn calculation.
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