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SELLERS' EXPECTATIONS: One of the five supply determinants assumed constant when a supply curve is constructed, and that shift the supply curve when they change. The other four are resource prices, technology, other prices, and number of sellers. If sellers expect the future price will be greater, then they're likely to sell less today, to take advantage of the higher future price. Alternatively, if sellers expect a lower future price, then they're likely to sell more today, hoping to avoid the lower price. A higher future price induces an decrease in supply and a lower future price induces a increase in supply.

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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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    AGGREGATE DEMAND

    The total real expenditures on final goods and services produced in the domestic economy that buyers are willing and able to undertake at different price levels, during a given time period (usually a year). Aggregate demand, usually abbreviated AD, is an inverse relation between price level and aggregate expenditures. This is one half of the AS-AD (aggregate market) analysis. The other half is aggregate supply. Aggregate demand consists of four aggregate expenditures--consumption expenditures, investment expenditures, government purchases, and net exports--made by the four macroeconomic sectors--household, business, government, and foreign.

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    Today, you are likely to spend a great deal of time browsing through a long list of dot com websites looking to buy either a 200-foot blue garden hose or a video camera with stop action features. Be on the lookout for mail order catalogs with hidden messages.
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    The Dow Jones family of stock market price indexes began with a simple average of 11 stock prices in 1884.
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