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ASSUMPTIONS, KEYNESIAN ECONOMICS: The macroeconomic study of Keynesian economics relies on three key assumptions--rigid prices, effective demand, and savings-investment determinants. First, rigid or inflexible prices prevent some markets from achieving equilibrium in the short run. Second, effective demand means that consumption expenditures are based on actual income, not full employment or equilibrium income. Lastly, important savings and investment determinants include income, expectations, and other influences beyond the interest rate. These three assumptions imply that the economy can achieve a short-run equilibrium at less than full-employment production.
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SHORT-RUN PRODUCTION ALTERNATIVES A firm faces three production options in the short run based on a comparison between price, average total cost, and average variable cost. If price is greater than average total cost, a firm earns an economic profit by producing the quantity that equates marginal revenue with marginal cost. If price is less than average total cost but greater than average variable cost, a firm incurs an economic loss, but produces the quantity that equates marginal revenue with marginal cost. If price is less than average variable cost, a firm shuts down production in the short run, incurring an economic loss equal to total fixed cost.
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PURPLE SMARPHIN
[What's This?]
Today, you are likely to spend a great deal of time looking for a downtown retail store hoping to buy either a Boston Red Sox baseball cap or a square lamp shade with frills along the bottom. Be on the lookout for mail order catalogs with hidden messages.
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A half gallon milk jug holds about $50 in pennies.
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"It is not because things are difficult that we do not dare; it is because we do not dare that they are difficult. " -- Seneca, statesman, dramatist, philosopher
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MC
Marginal Cost
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