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“Yeah. You’re choosing to study. But you’re not actually studying . You’re just sitting here, sad. So the cost of this Friday night isn’t the arcade—it’s your lost happiness plus the bad grade you’ll get tomorrow because you’re too tired to focus.”
Riya blinks. Her twelve-year-old brother has just weaponized marginal utility.
Aarav pauses the movie. “Did you know,” he says, “that according to your book, right now you’re suffering from ‘high opportunity cost’?”