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EXCESS CAPACITY: A condition that exists when monopolistic competition achieves long-run equilibrium such that production by each firm is less than minimum efficient scale. The implication of this condition is that each firm is not producing up to its fullest capacity, as would be the case under perfect competition, and thus more firms are need to produce total market output compared to perfect competition. Excess capacity results because market control means a monopolistically competitive firm faces a negatively-sloped demand curve. Long-run equilibrium is thus achieved by the tangency of the negatively-sloped demand curve and the long-run average cost curve, which results in economies to scale.

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KEYNESIAN MODEL

A macroeconomic model based on the principles of Keynesian economics that is used to identify the equilibrium level of, and analyze disruptions to, aggregate production and income. This model identifies equilibrium aggregate production and income as the intersection of the aggregate expenditures line and the 45-degree line. The Keynesian model comes in three basic variations designated by the number of macroeconomic sectors included--two-sector, three-sector, and four sector. The Keynesian model is also commonly presented in the form of injections and leakages in addition to the standard aggregate expenditures format. This model is used to analyze several important topics and issues, including multipliers, business cycles, fiscal policy, and monetary policy.

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The first paper currency used in North America was pasteboard playing cards "temporarily" authorized as money by the colonial governor of French Canada, awaiting "real money" from France.
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