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AD-AS MODEL: An economic model relating the price level and real production that is used to analyze business cycles, gross domestic product, unemployment, inflation, stabilization policies, and related macroeconomic phenomena. The AS-AD model, inspired by the standard market model, captures the interaction between aggregate demand (the buyers) and short-run and long-run aggregate supply (the sellers).

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Lesson Contents
Unit 1: The Basics
  • Opportunity Cost
  • Cost Times Two
  • Profit Times Three
  • Unit 1 Summary
  • Unit 2: Three Totals
  • Fixed And Variable
  • A Table Of Totals
  • Total Curves
  • TP And TVC
  • Unit 2 Summary
  • Unit 3: Four More Measures
  • Three Averages
  • A Table Of Averages
  • Average Curves
  • One Marginal
  • A Marginal Table
  • The Marginal Curve
  • Unit 3 Summary
  • Unit 4: Long-Run Cost
  • Doing The Long Run
  • A Choice Of Plants
  • Planning Curve
  • Scale Economies
  • Unit 4 Summary
  • Unit 5: Previewing Supply
  • Production Stages
  • Marginal Cost
  • Unit 5 Summary
  • Course Home
    Cost

    • The first unit of this lesson, The Basics, begins this our study with a review of the opportunity cost notion and how it relates to business activity.
    • In the second unit, Three Totals, we take a look at the three total cost measures, including total cost, total variable cost, and total fixed cost.
    • The third unit, Four More Measures, then presents four additional cost measures -- average total cost, average variable cost, average fixed cost, and marginal cost.
    • In the fourth unit, Long-Run Cost, we examine how scale economies and diseconomies affect cost in the long run.
    • The fifth and final unit, Previewing Supply, then closes this lesson by previewing the importance of cost, especially marginal cost, to the supply decision by a firm.

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    ASSUMPTIONS, KEYNESIAN ECONOMICS

    The macroeconomic study of Keynesian economics relies on three key assumptions--rigid prices, effective demand, and savings-investment determinants. First, rigid or inflexible prices prevent some markets from achieving equilibrium in the short run. Second, effective demand means that consumption expenditures are based on actual income, not full employment or equilibrium income. Lastly, important savings and investment determinants include income, expectations, and other influences beyond the interest rate. These three assumptions imply that the economy can achieve a short-run equilibrium at less than full-employment production.

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    APLS

    GREEN LOGIGUIN
    [What's This?]

    Today, you are likely to spend a great deal of time browsing through a long list of dot com websites trying to buy either a key chain with a built-in flashlight and panic button or a green and yellow striped sweater vest. Be on the lookout for deranged pelicans.
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    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.
    "Good humor is a tonic for mind and body. It is the best antidote for anxiety and depression. It is a business asset. It attracts and keeps friends. It lightens human burdens. It is the direct route to serenity and contentment."

    -- Grenville Kleiser, Author

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    Gross National Product
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