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OPPORTUNITY COST: The highest valued alternative foregone in the pursuit of an activity. This is a hallmark of anything dealing with economics--and life for that matter--because any action that you take prevents you from doing something else. The ultimate source of opportunity cost is the pervasive problem of scarcity (unlimited wants and needs, but limited resources). Whenever limited resources are used to satisfy one want or need, there are an unlimited number of other wants and needs that remain unsatisfied. Herein lies the essence of opportunity cost. Doing one thing prevents doing another.

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AVERAGE FACTOR COST CURVE, PERFECT COMPETITION

A curve that graphically represents the relation between average factor cost incurred by a perfectly competitive firm for employing an input and the quantity of input used. Because average factor cost is essentially the price of the input, the average factor cost curve is also the supply curve for the input. The average factor cost curve for a perfectly competitive firm with no market control is horizontal. The average revenue curve for a firm with market control is positively sloped.

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Today, you are likely to spend a great deal of time looking for the new strip mall out on the highway seeking to buy either arch supports for your shoes or an AC adapter that works with your MPG player. Be on the lookout for bottles of barbeque sauce that act TOO innocent.
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The penny is the only coin minted by the U.S. government in which the "face" on the head looks to the right. All others face left.
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