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THREE QUESTIONS OF ALLOCATION: The three basic questions that an economy must answer because of limited resources and unlimited wants and needs are: What? How? and For Whom? The basic problem of scarcity requires every society to determine: What goods to produce? How to produce the goods? and Who receives the goods that are produced?

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SAVING-INVESTMENT MODEL

A variation of the Keynesian injections-leakages model that includes the two private sectors, the household sector and the business sector. This variation, more formally termed the two-sector injections-leakages model, captures the interaction between induced saving (and indirectly induced consumption expenditures) and autonomous investment expenditures. This model provides an alternative to the two-sector aggregate expenditures (Keynesian cross) analysis of the macroeconomy, including equilibrium, disequilibrium, and the multiplier. Equilibrium is identified as the intersection between the saving line and the investment line. Two related variations are the three-sector injections-leakages model and the four-sector injections-leakages model.

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Today, you are likely to spend a great deal of time flipping through mail order catalogs wanting to buy either a packet of address labels large enough for addresses of both the sender and the recipient or a key chain with a built-in flashlight and panic button. Be on the lookout for pencil sharpeners with an attitude.
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Woodrow Wilson's portrait adorned the $100,000 bill that was removed from circulation in 1929. Woodrow Wilson was removed from circulation in 1924.
"Even a mistake may turn out to be the one thing necessary to a worthwhile achievement."

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