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TOTAL COST AND MARGINAL COST: A mathematical connection between marginal cost and total cost stating that marginal cost IS the slope of the total cost curve. If the total cost curve has a positive slope (that is, is upward sloping), then marginal cost is positive. Moreover, if the total cost curve has a positive and increasingly steeper slope, then the marginal cost is positive and rising. If the total cost curve has a positive and decreasingly steeper slope, then the marginal cost is positive but falling.

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Lesson Contents
Unit 1: Measuring Production
  • An Indicator
  • Total Market Value
  • Final Goods and Services
  • Given Year
  • Unit 1 Summary
  • Unit 2: Looking Behind GDP
  • Ins and Outs
  • Past and Future
  • Estimated Value
  • Home Production
  • Illegal Goods
  • GDP
  • Real GDP
  • Unit 2 Summary
  • Unit 3: Two Views of GDP
  • Demand and Supply
  • Expenditures
  • Resources
  • Unit 3 Summary
  • Unit 4: Measuring Income
  • National Income
  • Personal Income
  • IEBNR
  • IRBNE
  • Unit 4 Summary
  • Unit 5: Issues
  • What It Does
  • What It Doesn't Do
  • Unit 5 Summary
  • Course Home
    Gross Domestic Product

    This lesson investigates one of the most noted and important measures of macroeconomic activity -- gross domestic product (GDP). GDP measures the total production of goods and services that, in principle, are available to satisfy consumers wants and needs. We see the ins and outs of the GDP measure. As a bonus, we also get a close look at several related measures of production and income, including net domestic product (NDP), national income (NI), personal income (PI), and disposable income (PI).

    • In the first unit of this lesson, we take a look at the process of measuring gross domestic product, including what, in principle, is being measure.
    • The second unit the turns to a detailed look at what IS included in GDP and what IS NOT included in the GDP based on the difference between market transactions and economic production.
    • With the third unit we take a look at the two views of measuring GDP -- expenditures and resource costs.
    • Moving on to the fourth unit, we get a look at the three related measures of income -- national income, personal income, and disposable income.
    • And finally, the fifth unit considers a few issues related to measuring GDP, including what BDP does measure and what GDP doesn't measure.

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    AVERAGE VARIABLE COST CURVE

    A curve that graphically represents the relation between average variable cost incurred by a firm in the short-run product of a good or service and the quantity produced. This curve is constructed to capture the relation between average variable cost and the level of output, holding other variables, like technology and resource prices, constant. The average variable cost curve is one of three average curves. The other two are average total cost curve and average fixed cost curve. A related curve is the marginal cost curve.

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