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INTERCEPT, AGGREGATE EXPENDITURES LINE: The intercept of the aggregate expenditures line indicates autonomous expenditures, aggregate expenditures that do not depend on the level of income or production. This can be thought of as aggregate expenditures that the four macroeconomic sectors (household, business, government, and foreign) undertake regardless of the state of the economy. Autonomous expenditures are affected by the aggregate expenditures determinants, which cause a change in the intercept and a shift of the aggregate expenditures line.

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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.

     See also | short run | supply curve | perfect competition | marginal cost curve | average variable cost curve | profit maximization | price | marginal cost | law of diminishing marginal returns | law of supply | market control | short-run supply curve, monopoly | short-run supply curve, monopolistic competition |


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RATIONAL BEHAVIOR

The notion that people make decisions based on the desire to obtain the greatest amount of satisfaction. Rational behavior essentially means that people prefer more to less. The presumption of rational behavior underlies most economic analysis, especially that applied to consumer demand theory.

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Today, you are likely to spend a great deal of time at a garage sale hoping to buy either a genuine down-filled comforter or a 200-foot blue garden hose. Be on the lookout for letters from the Internal Revenue Service.
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Paper money used by the Commonwealth of Massachusetts prior to the U.S. Revolutionary War, which was issued against the dictates of Britain, was designed by patriot and silversmith, Paul Revere.
"The majority of men meet with failure because of their lack of persistence in creating new plans to take the place of those that fail. "

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