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IMPERFECT COMPETITION: Any markets or industries that do not match the criteria for perfect competition. The key characteristics of perfect competition are: (1) a large number of small firms, (2) identical products sold by all firms, (3) freedom of entry into and exit out of the industry, and (4) perfect knowledge of prices and technology. These four characteristics are essentially impossible to match in the real world.

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MARGINAL PROPENSITY TO SAVE

The proportion of each additional dollar of household income that is used for saving. The marginal propensity to save (abbreviated MPS) is another term for the slope of the saving line and is calculated as the change in saving divided by the change in income. The MPS plays a central role in Keynesian economics. It quantifies the saving-income relation, which is the flip side of the consumption-income relation, and thus it reflects the fundamental psychological law. It is also a critical to the multiplier process. A related saving measure is the average propensity to save.

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Today, you are likely to spend a great deal of time flipping through the yellow pages seeking to buy either an AC adapter that won't fry your computer or a case for your designer sunglasses. Be on the lookout for vindictive digital clocks with revenge on their minds.
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In the Middle Ages, pepper was used for bartering, and it was often more valuable and stable in value than gold.
"The truth of the matter is that you always know the right thing to do. The hard part is doing it."

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