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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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MARGINAL REVENUE PRODUCT AND FACTOR DEMAND

A perfectly competitive firm's factor demand curve is that negatively-sloped portion of its marginal revenue product curve. A perfectly competitive firm maximizes profit by hiring the quantity of input that equates factor price and marginal revenue product. As such, the firm moves along its negatively-sloped marginal revenue product curve in response to changing factor prices.

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BLUE PLACIDOLA
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Today, you are likely to spend a great deal of time searching the newspaper want ads looking to buy either a 200-foot blue garden hose or a video camera with stop action features. Be on the lookout for the last item on a shelf.
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This isn't me! What am I?

Sixty percent of big-firm executives said the cover letter is as important or more important than the resume itself when you're looking for a new job
"Ships are safe in harbor. But that is not what ships are for."

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European Currency Unit
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