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MARKET POWER: The ability of buyers or sellers to exert influence over the price or quantity of a good, service, or commodity exchanged in a market. Market power largely depends on the number of competitors on each side of the market. If a market has relatively few buyers, but many sellers, then limited competition on the demand-side of the market means buyers tend to have relatively more market power than sellers. The converse occurs if there are many buyers, but relatively few sellers. This is also termed market control.

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MARGINAL COST

The change in total cost (or total variable cost) resulting from a change in the quantity of output produced by a firm in the short run. Marginal cost (MC) indicates how much total cost changes for a given change in the quantity of output. Because changes in total cost are matched by changes in total variable cost in the short run (total fixed cost is fixed), marginal cost is the change in either total cost or total variable cost. It is found by dividing the change in total cost (or total variable cost) by the change in output. Marginal cost is one of four cost concepts used in short-run production analysis. The other three are average total cost, average fixed cost, and average variable cost.

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Today, you are likely to spend a great deal of time surfing the Internet wanting to buy either a video camera with stop action features or one of those memory foam pillows. Be on the lookout for bottles of barbeque sauce that act TOO innocent.
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Ragnar Frisch and Jan Tinbergen were the 1st Nobel Prize winners in Economics in 1969.
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