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SHORT-RUN SUPPLY CURVE: For a perfectly competitive firm, the marginal cost curve that lies above the average variable cost curve. This segment of the marginal cost guides a perfectly competitive firm's profit maximizing production as it equates price to marginal cost. Because the marginal cost curve is positively sloped (due to the law of diminishing marginal returns), each firm's supply curve and the market supply curve are also positively sloped. The law of diminishing marginal returns thus provides an explanation for the law of supply. However, this only works for firms with NO market control. Monopoly, monopolistic competition, and oligopoly, with market control, do not achieve the same result.

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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 browsing through a long list of dot com websites seeking to buy either a square lamp shade with frills along the bottom or an electric coffee pot with automatic shutoff. Be on the lookout for the last item on a shelf.
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Okun's Law posits that the unemployment rate increases by 1% for every 2% gap between real GDP and full-employment real GDP.
"If I'm selecting a group, the first thing I look for is a record of achievement . . . If (candidates achieve) in small things, there's a very good chance they'll perform well in big things. "

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Business Cycle Development
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