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UNSTABLE EQUILIBRIUM: An equilibrium that is NOT restored if disrupted by an external force. This should be contrasted with stable equilibrium. While most equilibria studied in economics are of the stable variety, a few cases of unstable equilibria do emerge from time to time, in limited circumstances.

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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 strolling around a discount warehouse buying club looking to buy either a hepa filter for your furnace or a wall poster commemorating next Thursday. Be on the lookout for gnomes hiding in cypress trees.
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Ragnar Frisch and Jan Tinbergen were the 1st Nobel Prize winners in Economics in 1969.
"The only profit center is the customer."

-- Peter Drucker, educator

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