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PERFECT COMPETITION CHARACTERISTICS: The four key characteristics of perfect competition are: (1) 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 mean that a given perfectly competitive firm is unable to exert any control whatsoever over the market.

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TOTAL-MARGINAL RELATION

A mathematical connection between a marginal value and the corresponding total value stating that the marginal IS the slope of the total curve. This mathematical relation between total and marginal surfaces throughout the study of economics, especially utility (total utility and marginal utility), production (total product and marginal product), cost (total cost and marginal cost), and revenue (total revenue and marginal revenue). A related mathematical relation exists between a marginal value and the corresponding average value.

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BLACK DISMALAPOD
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Today, you are likely to spend a great deal of time browsing about a thrift store hoping to buy either a graduation present for your niece or nephew or a toaster oven that has convection cooking. Be on the lookout for neighborhood pets, especially belligerent parrots.
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The 1909 Lincoln penny was the first U.S. coin with the likeness of a U.S. President.
"I do the best I know how, the very best I can, and I mean to keep doing so until the end. "

-- Abraham Lincoln, 16th US president

MCP
Marginal Cost Pricing
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