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SAVING LINE: A graphical depiction of the relation between household saving and household disposable income. The slope of this line is positive, greater than zero, less than one, and goes by the name marginal propensity to save. The vertical intercept of the saving line is autonomous saving. The saving and investment, or leakage and injection, analysis used in Keynesian economics begins with the saving line. Because consumption is the difference between disposable income and saving, the consumption line is a complementary relation to the saving line.

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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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    PRODUCER SURPLUS

    The revenue that producers obtain from a good over and above the price paid. This is the difference between the minimum supply price that sellers are willing to accept and the price that they actually receive. A related notion from the demand side of the market is consumer surplus.

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