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OLIGOPOLY: A market structure dominated by a small number of large firms, selling either identical or differentiated products, and significant barriers to entry into the industry. This is one of four basic market structures. The other three are perfect competition, monopoly, and monopolistic competition.

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MARGINAL REVENUE PRODUCT

The change in total revenue resulting from a unit change in a variable input, keeping all other inputs unchanged. Marginal revenue product, usually abbreviated MRP, is found by dividing the change in total revenue by the change in the variable input or by multiplying marginal physical product by marginal revenue. This is also termed value of the marginal product. Marginal revenue product is a key concept for understanding the demand for productive inputs.

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Today, you are likely to spend a great deal of time at a flea market looking to buy either a T-shirt commemorating next Thursday or a birthday gift for your uncle. Be on the lookout for deranged pelicans.
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A half gallon milk jug holds about $50 in pennies.
"Success is more a function of consistent common sense than it is of genius. "

-- An Wang, industrialist

GDP
Gross Domestic Product
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