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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 PRODUCT

The change in the quantity of total product resulting from a unit change in a variable input, keeping all other inputs unchanged. Marginal product, usually abbreviated MP, is found by dividing the change in total product by the change in the variable input. Marginal product, which occasionally goes by the alias marginal physical product (MPP), is one of two measures derived from total product. The other is average product.

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Today, you are likely to spend a great deal of time going from convenience store to convenience store looking to buy either several magazines on time travel or 500 feet of telephone cable. Be on the lookout for the happiest person in the room.
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In the early 1900s around 300 automobile companies operated in the United States.
"Time is the scarcest resource, and unless it is managed nothing else can be managed."

-- Peter F. Drucker

JFE
Journal of Financial Economics
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