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October 9, 2026 

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LONG-RUN EQUILIBRIUM CONDITIONS: The long-run equilibrium of 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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AE LINE: Another term for aggregate expenditure line, which is a line representing the relation between aggregate expenditures and gross domestic product used in the Keynesian cross. The aggregate expenditure line is obtained by adding investment expenditures, government purchases, and net exports to the consumption line. As such, the slope of the aggregate expenditure line is largely based on the slope of the consumption line (which is the marginal propensity to consume), with adjustments coming from the marginal propensity to invest, the marginal propensity for government purchases, and the marginal propensity to import. The intersection of the aggregate expenditures line and the 45-degree line identifies the equilibrium level of output in the Keynesian cross.

     See also | aggregate expenditures | gross domestic product | Keynesian cross | consumption expenditures | investment expenditures | government purchases | net exports | consumption line | marginal propensity to consume | marginal propensity to invest | marginal propensity for government purchases | marginal propensity to import | 45-degree line | Keynesian economics | aggregate demand |


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FEDERAL RESERVE NOTES

Paper currency issued and authorized by the Federal Reserve System and used along with Treasury coins and checkable deposits as the M1 money supply for the U.S. economy. Federal Reserve notes were first issued in 1913 and currently circulate in denominations of $1, $2, $5, $10, $20, $50, and $100. These notes underwent a major redesign to prevent counterfeiting in the 1990s.

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