March 23, 2018 

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LONG-RUN MARGINAL COST: The change in the long-run total cost of producing a good or service resulting from a change in the quantity of output produced. Like all marginals, long-run marginal cost is the increment in the corresponding total. What's most notable about long-run marginal cost, however, is that we are operating in the long run. Unlike the short run, in which at least one input is fixed, there are no fixed inputs in the long run. As such, there is only variable cost. This means that long-run marginal cost is the result of changes in the cost of all inputs.

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Lesson Contents
Unit 1: An Overview
  • Elasticity And Demand
  • Price Elasticity Of Demand
  • Upon Further Review
  • Unit 1 Summary
  • Unit 2: The Continuum
  • Relative Adjustments
  • Five Alternatives
  • Three Of Five
  • Two Of Five
  • Unit 2 Summary
  • Unit 3: Measurement
  • Doing The Numbers
  • A Range Of Values
  • The Demand Curve
  • Slope And Elasticity
  • Changing Elasticity
  • Total Revenue
  • Expenditures And Elasticity
  • Unit 3 Summary
  • Unit 4: Determinants
  • Substitute Availability
  • Time Period
  • Budget Proportion
  • Unit 4 Summary
  • Unit 5: Other Measures
  • Price Elasticity Of Supply
  • Income Elasticity Of Demand
  • Cross Elasticity Of Demand
  • Unit 5 Summary
  • Course Home
    Elasticity and Demand

    Elasticity is the relative responsiveness of one variable to changes in another variable. Economists find this notion of elasticity quite useful in the study of markets. In this lesson, we examine the basics of demand elasticity, especially the price elasticity of demand.

    • The first unit of this lesson, An Overview, gets us started with a review of several concepts related to elasticity and demand.
    • In the second unit, The Continuum, we take a close look at how the five elasticity alternatives are reflected by demand curves.
    • The third unit, Measurement, runs through some numbers for measuring the price elasticity of demand, and how elasticity values related to a straightline demand curve.
    • The fourth unit, Determinants, examines how the three determinants of elasticity affect the elasticity coefficient.
    • The fifth unit and final unit, Other, closes this lesson by introducing examine three related elasticity measures.

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    Gross domestic product is the total market value of all goods and services produced within the political boundaries of an economy during a given period of time, usually one year. Obtaining this value is not a simple task. It requires combining a lot of information from a number of different sources. For the U.S. economy, this includes trillions of dollars worth of production, hundreds of million of consumers, hundreds of thousands of businesses, and a bunch of market transactions each year.

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