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AGGREGATE EXPENDITURE LINE: 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.

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Lesson 1: Economic Basics | Unit 3: The Economy Page: 9 of 18

Topic: A Mixed Economy: The Mix <=PAGE BACK | PAGE NEXT=>

A pure market economy and a pure command economy are two theoretical extremes in the allocation of resources.
  • Real world economies form a continuum bounded by these two extremes. They are mixed economies:
  • A mixed economy is one that relies on both markets and government to allocate resources.
  • Market-oriented economies, also called capitalism, are mixed economies that lean heavily to the market end.
  • Socialism and communism are mixed economies that lean more (a lot more) toward government control.

The mixed U.S. economy leans heavily to the market end of the market-government continuum.

Three indicators of government involvement:
  • Taxes: Government controls about 1/3 of the revenue generated in the economy each year.
  • Spending: Government buys 20% of the goods produced each year.
  • Regulations: Government influences many allocation decisions through laws, rules, and other restrictions.

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ACCOUNTING COST

An actual outlay or expenses incurred in the production of a good that shows up in a firm's accounting statements and records. Accounting cost is an explicit payment (that is, money changing hands) incurred by a firm. Accounting cost, while very important to accountants, company CEOs, shareholders, and the Internal Revenue Service, is only minimally important to economists. The reason is that economists are more interested in economic cost (also called opportunity cost), which is the value of foregone production.

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Today, you are likely to spend a great deal of time at the confiscated property police auction hoping to buy either a computer that can play video games and burn DVDs or a black duffle bag with velcro closures. Be on the lookout for celebrities who speak directly to you through your television.
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In the Middle Ages, pepper was used for bartering, and it was often more valuable and stable in value than gold.
"The greatest things ever done on Earth have been done little by little. "

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