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SAY'S LAW: A classical economic proposition stating that the production of aggregate output creates sufficient aggregate demand to purchase all of the output produced. In other words, supply creates its own demand. This is one of the three assumptions underlying the macroeconomic theory of classical economics which concluded that unrestricted market activity would generate full employment. The other two assumptions are flexible prices and saving-investment equality. Say's law is closely associated with the circular flow model.

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Lesson Contents
Unit 1: Buying Basics
  • The Concept
  • Demand Price
  • Quantity Demanded
  • Unit 1 Summary
  • Unit 2: Law of Demand
  • Definition
  • Income Effect
  • Substitution Effect
  • Unit 2 Summary
  • Unit 3: Demand Curve
  • Schedule
  • Curve
  • Space
  • Unit 3 Summary
  • Unit 4: Determinants
  • Ceteris Paribus Factors
  • Shifters: Increase
  • Shifters: Decrease
  • Types
  • Ch...Ch...Changes
  • Unit 4 Summary
  • Unit 5: Scarcity
  • Unlimited Wants
  • Unit 5 Summary
  • Unit 6:
  • Unit 6 Summary
  • Course Home
    Demand

    This lesson on demand offers a little insight into the purchases of a wide range of goods. In fact, this demand topic is does more than offer insight into buying behavior. It's also one half of the market analysis -- the other half being supply. And market analysis is one of the most widely used tools in the study of economics. Economists explain a lot of economic phenomenon using markets. But to use markets, we need demand. And that brings us back to this lesson.

    • In the first unit of this lesson we examine the basic concept of demand. While you've likely come across the term demand before, we'll see the specific way the term is used in economics.
    • The second unit then takes a look at the law of demand, which is one of the most important and most fundamental economic principles that we'll encounter.
    • As we more on to the third unit, our attention turns to the demand curve, which is the graphical embodiment of the demand concept.
    • In the fourth unit, we examine how the five basic demand determinants cause the demand curve to shift from one location to another.
    • And finally in the fifth unit, we make a connection between demand and the fundamental problem of scarcity.

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    UNIT OF ACCOUNT

    The money function in which money is used as the common benchmark to designate the prices of goods exchanged throughout the economy. Unit of account, or measure of value, means money is functioning as the measuring unit for prices. In other words, prices of goods are stated in terms of the monetary unit. This is one of four basic functions of money. The other three are medium of exchange, store of value, and standard of deferred payment.

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    Today, you are likely to spend a great deal of time at a flea market wanting to buy either a weathervane with a cow on top or a box of multi-colored, plastic paper clips. Be on the lookout for telephone calls from long-lost relatives.
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    Parker Brothers, the folks who produce the Monopoly board game, prints more Monopoly money each year than real currency printed by the U.S. government.
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