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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.

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Lesson Contents
Unit 1: The Concept
  • A Definition
  • So What?
  • Unit 1 Summary
  • Unit 2: Resources
  • Factors
  • Working Together
  • Free or Scarce?
  • Comparisons
  • Unit 2 Summary
  • Unit 3: Opportunity Cost
  • The Concept
  • Economic Cost
  • Unit 3 Summary
  • Unit 4: College Cost
  • Out of Pocket
  • What Else?
  • Unit 4 Summary
  • Unit 5: THE Problem
  • No Free Lunch
  • Solutions?
  • Unit 5 Summary
  • Course Home
    Scarcity

    In this lesson you'll see why scarcity tends to make economists grumpy. You'll see that scarcity is a perpetual condition that exists because people have unlimited wants and needs, but limited resources used to satisfy these wants and needs. You'll also see how this scarcity problem underlies the common notion of cost, which is integral to the study of economics. The five units contained in this lesson provide a tour through the economic problem of scarcity.

    • The first unit examines the fundamental concept of scarcity -- the combination of limited resources and unlimited wants and needs -- that is virtually synonymous with the study of economics.
    • The second unit discusses the four basic categories of limited resources --labor, capital, land, and entrepreneurship -- that produce the goods that are used to satisfy unlimited wants and needs.
    • In the third unit, we take a look at the notion of opportunity cost and see how it is related to the scarcity problem.
    • We then turn out attention in the fourth unit to a simple example of the explicit and implicit costs of attending college.
    • The fifth and final unit in this lesson then ponders why scarcity is considered THE economic problem and providing a little insight into why economists are grump.

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    SLOPE, LONG-RUN AGGREGATE SUPPLY CURVE

    The long-run aggregate supply (LRAS) curve is a vertical line with an infinite slope, reflecting the independent relation between the price level and aggregate real production. A higher price level is associated with the same real production as a lower price level. This is the real production generated when resources are fully employed, that is, full-employment production.

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    APLS

    BLUE PLACIDOLA
    [What's This?]

    Today, you are likely to spend a great deal of time searching for rummage sales hoping to buy either a coffee cup commemorating the moon landing or a how-to book on surfing the Internet. Be on the lookout for pencil sharpeners with an attitude.
    Your Complete Scope

    This isn't me! What am I?

    The first paper currency used in North America was pasteboard playing cards "temporarily" authorized as money by the colonial governor of French Canada, awaiting "real money" from France.
    "Far and away the best prize that life has to offer is the chance to work hard at work worth doing."

    -- Theodore Roosevelt, 26th US president

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