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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 FOR GOVERNMENT PURCHASES

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

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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 wanting to buy either a graduation present for your niece or nephew or a toaster oven that has convection cooking. Be on the lookout for attractive cable television service repair people.
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Only 1% of the U.S. population paid income taxes when the income tax was established in 1914.
"When you play, play hard; when you work, don't play at all. "

-- Theodore Roosevelt, 26th US president

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