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- WHY IS ECONOMICS RELEVANT VERSUS IMPORTANT?What makes Economic Decisions different from other Design Decisions?It’s Friday night. You already have a ticket to aconcert, which cost you $30. A friend invites youto go out for a game of paintball instead. Admission would cost you $25, and you think you’d get$25 worth of enjoyment out of it. Your concertticket is nonrefundable. What is your opportunitycost (in dollars) of playing paintball?