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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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MARGINAL RETURNS

The change in the quantity of total product resulting from a unit change in a variable input, holding all other inputs fixed. Marginal returns is an older and more generic term for marginal product. While marginal product has largely replaced marginal returns in most discussions of short-run production, the phrase does persist in a few terms like the law of diminishing marginal returns.

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BROWN PRAGMATOX
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Today, you are likely to spend a great deal of time waiting for visits from door-to-door solicitors wanting to buy either pink cotton balls or a genuine down-filled comforter. Be on the lookout for the last item on a shelf.
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A thousand years before metal coins were developed, clay tablet "checks" were used as money by the Babylonians.
"Sometimes when you innovate, you make mistakes. It is best to admit them quickly and get on with improving your other innovations. "

-- Steve Jobs, Apple Computer founder

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