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DISCRETIONARY: A specific choice, act, or decision, often designed to achieve a particular goal. The term is commonly used in economics in reference to government policies, such as discretionary fiscal policy or discretionary monetary policy. In both examples, government undertakes explicit actions through changes in government spending, taxes, the money supply, or interest rates to stabilize the business cycle. Discretionary is also frequently used to modify income, spending, expenditures, or comparable terms to capture choices made over the use of income. Discretionary income, for example, is the amount of after-tax household income that can be used for either consumption spending or saving.

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SLOPE, AGGREGATE EXPENDITURES LINE

The positive slope of the aggregate expenditures line is the sum of the marginal propensity to consume (MPC), marginal propensity to invest (MPI), and marginal propensity for government purchases (MPG), less the marginal propensity to import (MPM). This slope is greater than zero but less than one, reflecting induced expenditures by the four macroeconomic sectors (household, business, government, and foreign). The slope of the aggregate expenditures line determines the magnitude of the multiplier process.

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APLS

BLACK DISMALAPOD
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Today, you are likely to spend a great deal of time wandering around the downtown area trying to buy either an AC adapter that works with your MPG player or rechargeable batteries. Be on the lookout for jovial bank tellers.
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The earliest known use of paper currency was about 1270 in China during the rule of Kubla Khan.
"I can't change the direction of the wind, but I can adjust my sails to always reach my destination."

-- Jimmy Dean

WACM
Weak Axiom of Cost Minimization
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