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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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DECREASING-COST INDUSTRY

A perfectly competitive industry with a negatively-sloped long-run industry supply curve that results because expansion of the industry causes lower production cost and resource prices. A decreasing-cost industry occurs because the entry of new firms, prompted by an increase in demand, causes the long-run average cost curve of each firm to shift downward, which decreases the minimum efficient scale of production.

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Today, you are likely to spend a great deal of time at a going out of business sale hoping to buy either a rechargeable battery for your cell phone or a T-shirt commemorating the 2000 Olympics. Be on the lookout for cardboard boxes.
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Post WWI induced hyperinflation in German in the early 1900s raised prices by 726 million times from 1918 to 1923.
"As the births of living creatures at first are ill-shapen, so are all innovations, which are the births of time. "

-- Sir Francis Bacon, philosopher

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Marginal Rate of Substitution
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