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PERFECT COMPETITION, LONG-RUN EQUILIBRIUM CONDITIONS: The long-run equilibrium of a perfectly competitive industry generates six specific equilibrium conditions, including: (1) economic efficiency (P = MC), (2) profit maximization (MR = MC), (3) perfect competition (MR = AR = P), (4) breakeven output (P = AR = ATC), (5) minimum production cost (MC = ATC), and (6) minimum efficient scale (MC = ATC = LRAC = LRMC).

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THREE-SECTOR AGGREGATE EXPENDITURES LINE

A graphical depiction of the relation between aggregate expenditures by the three domestic macroeconomic sectors (household, business, and government) and the level of aggregate income or production. The three-sector aggregate expenditures line combines consumption expenditures, investment expenditures, and government purchases. The slope of this aggregate expenditures line is based on the marginal propensity to consume, adjusted for marginal propensities of the other expenditures that are assumed to be induced when constructing the line. This is one of three aggregate expenditures lines based on the number of sectors included. The others are the two-sector aggregate expenditures line and the four-sector aggregate expenditures line.

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Today, you are likely to spend a great deal of time waiting for visits from door-to-door solicitors looking to buy either a weathervane with a chicken on top or a flower arrangement with daisies and carnations for your uncle. Be on the lookout for malfunctioning pocket calculators.
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Only 1% of the U.S. population paid income taxes when the income tax was established in 1914.
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