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ACTIVIST POLICY: Government policies that involve explicit actions designed to achieve specific goals. A common type of activist policy is that designed to stabilize business cycles, reduce unemployment, and lower inflation, through government spending and taxes (fiscal policy) or the money supply (monetary policy). Activist policies are also term discretionary policies because they involve discretionary decisions by government. A contrast to activist policy is automatic stabilizers that help stabilize business cycles without explicit government actions.

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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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    AVERAGE REVENUE CURVE

    A curve that graphically represents the relation between average revenue received by a firm for selling its output and the quantity of output sold. Because average revenue is essentially the price of a good, the average revenue curve is also the demand curve for a firm's output. The average revenue curve for a firm with no market control is horizontal. The average revenue curve for a firm with market control is negatively sloped.

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