Students in metros focus too much on memorising elasticity formulas, forgetting that opportunity cost is the heart of the PPC. The trap is seeing these as separate topics, when a single question often weaves all three. I know this because tutoring my neighbour's son, I saw his costly coaching institute notes which were neatly divided, leaving him *shngain* and confused when the paper mixed them like life does. The river doesn't flow in sections.
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