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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 PROPENSITY TO IMPORT

The change in imports purchased from the foreign induced by a change in income or production (national income or gross domestic product). The marginal propensity to import (abbreviated MPM) is another term for the slope of the imports line and is calculated as the change in imports divided by the change in income or production. The MPM plays a role in Keynesian economics. It augments the slope of the aggregate expenditures line and is part to the multiplier process. A related marginal measure is the marginal propensity to consume.

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RED AGGRESSERINE
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Today, you are likely to spend a great deal of time browsing through a long list of dot com websites trying to buy either a cell phone case or a pair of designer sunglasses. Be on the lookout for letters from the Internal Revenue Service.
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This isn't me! What am I?

In the late 1800s and early 1900s, almost 2 million children were employed as factory workers.
"I can't change the direction of the wind, but I can adjust my sails to always reach my destination."

-- Jimmy Dean

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