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PERFECT COMPETITION, LONG-RUN ADJUSTMENT: A perfectly competitive industry undertakes a two-part adjustment to equilibrium in the long run. One is the adjustment of each perfectly competitive firm to the appropriate factory size that maximizes long-run profit. The other is the entry of firms into the industry or exit of firms out of the industry, to eliminate economic profit or economic loss. The end result of this long-run adjustment is a multi-faceted equilibrium condition that price is equal to marginal cost and average cost (both short run and long run).

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UNSTABLE EQUILIBRIUM

Equilibrium that is not restored if disrupted by an external force. Few economic models have an equilibrium that is unstable, reflecting the observation that the real world adapts to changes and maintains a fair degree of stability. However, there are situations where an unstable equilibrium more accurately reflects economic phenomena. The alternative to an unstable equilibrium is a stable equilibrium.

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Today, you are likely to spend a great deal of time flipping through the yellow pages hoping to buy either a T-shirt commemorating the 2000 Olympics or a genuine fake plastic Tiffany lamp. Be on the lookout for telephone calls from former employers.
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Potato chips were invented in 1853 by a irritated chef repeatedly seeking to appease the hard to please Cornelius Vanderbilt who demanded french fried potatoes that were thinner and crisper than normal.
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