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THIRD-WORLD COUNTRY: A country with a relatively low standard of living and which lacks the economic development of more advanced industrialized nations like the United States. Most third-world countries are in Africa, Asia, and South America and often rise to newsworthy prominence when they have a famine, are overthrown by a military dictator, or are invaded by a more developed country. They tend to have high rates of population growth and limited success in doing what's necessary to achieve economic growth.

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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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    MARKET CONTROL

    The ability of buyers or sellers to exert influence over the price or quantity of a good, service, or commodity exchanged in a market. Market control largely depends on the number of competitors on each side of the market. If a market has relatively few buyers, but many sellers, then limited competition on the demand-side of the market means buyers tend to have relatively more market control than sellers. The converse occurs if a market has many buyers, but relatively few sellers. This is also termed market power.

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    Today, you are likely to spend a great deal of time visiting every yard sale in a 30-mile radius hoping to buy either a velvet painting of Elvis Presley or a wall poster commemorating yesterday. Be on the lookout for broken fingernail clippers.
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    Al Capone's business card said he was a used furniture dealer.
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