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CHAPTER 7: DEMAND AND SUPPLY
Economics Per. 6
The “Marketplace”
Demand: All consumers have influence on the price of goods and
services How people in the marketplace decide what to buy and
at what price Supply:
How the people who are selling those things decide how much to sell and at what price
Market: Freely chosen actions between buyers and sellers of
goods and services Individuals decide the answers to WHAT? HOW? And for
WHOM?
Voluntary Exchange
A buyer and seller use their economic freedom to decide on terms and conditions of an exchange
Supply and Demand is a model of how buyers and sellers operate in the market
Cause and Effect in relation to price
Law of Demand
All the different quantities of goods and services that consumers will purchase at different prices
Willingness and ability “As price goes up, quantity demanded
goes down” “As price goes down, quantity demanded
goes up” Inverse relationship between quantity
demanded and price
Con’t.
3 Factors are: 1. Real Income Effect 2. Substitution Effect 3. Diminishing Marginal Utility
What does each factor mean and how does it effect the relationship between the quantity demanded and the price of a good or service?
The Demand Curve and Elasticity of Demand
Price per CD Quantity Demanded (millions)
$20 100
$19 200
$18 300
$17 400
$16 500
$15 600
$14 700
$13 800
$12 900
$11 1000
$10 1100
Con’t.
Demand Schedule: Table of prices and quantity demanded at that price
Plotting Quantity Demanded: On horizontal axis is the quantity demanded and on the vertical axis is the price Plot the quantity demanded based on the
price in the demand schedule Demand Curve: The downward sloping
line that connects the plotted points from the demand schedule
Determinants of Demand
Group Work: You will be divided into 5 groups. Each group will be assigned one of the five determinants of demand: 1. Change in population 2. Change in income 3. Changes in tastes and preferences 4. Substitutes 5. Complementary goods
Each group will tell us what their determinant means and then one member will come up and draw on the board how their determinant will effect the demand curve based on an example you choose.
Price Elasticity of Demand
How much consumers respond to a given change in price Ex. Certain brand of cereal increases in price,
consumer will probably buy another brand that is comparable
Inelastic Demand When a price change does not effect the quantity
demanded 3 factors: substitutes, % of a persons total
budget devoted to that good, and time consumers are give to adjust to price change Examples please?
Elastic versus Inelastic
Law of Supply and Supply Curve Supply: willingness and ability of producers to
provide goods and services at different prices in the market
“As the price rises for a good, the quantity supplied generally rises”
“As the price falls, the quantity supplied also falls” Direct relationship between price and quantity
supplied The higher the price the greater the incentive for
the producer to produce more Turns higher profits and covers the costs of producing
more
Supply Curve
Price per CD Quantity Supplied (millions)
$10 100
$11 200
$12 300
$13 400
$14 500
$15 600
$16 700
$17 800
$18 900
$19 1000
$20 1100
Con’t.
Supply Schedule: Table that shows that as the price increases so does the quantity supplied
Plotting Quantity Supplied: On horizontal axis is the quantity supplied and on the vertical axis is the price Plot the quantity supplied based on the price in
the supply schedule Supply Curve: The upward sloping line that
connects the plotted points from the supply schedule
Determinants of Supply
Group Work: You will be divided into 4 groups. Each group will be assigned one of the four determinants of supply: 1. Price of Inputs 2. Number of firms in the industry 3. Taxes 4. Technology
Each group will tell us what their determinant means and then one member will come up and draw on the board how their determinant will effect the supply curve based on an example of your choice. You may choose if the supply increases or decreases and you only have to demonstrate one.
Law of Diminishing Returns
Adding units of one factor of production to all other factors of production increases total output
But after a certain point, extra output for each additional unit will begin decrease
Ex. If you hire one or two more people to do a job you will increase your output, but adding anymore might begin to decrease your output
Supply and Demand Together Demand and Supply work together
As the price of a good goes down, quantity demanded rises and quantity supplied goes down
Equilibrium price Where the quantity supplied and thee
quantity demanded meet
Graph of Equilibrium Price
Shift in Equilibrium Price
Prices Serve as Signals
Rising prices signal producers to produce more and consumers to consume less, falling prices signal producers to produce less and consumers to purchase more
Shortages: at the current price, quantity demanded is greater than quantity supplied
Surpluses: at prices above the equilibrium price, suppliers produce more than consumers want to purchase
Market Forces: when operating without restriction, it eliminates shortages and surpluses
Price Control
Government gets involved in setting prices when it believes that the market forces of supply and demand are operating unfairly
Price Ceiling: a government set maximum that can be charged for goods and services (ex. Rent in NY City) What role does rationing and the black market
play in the economy when the gov’t sets ceilings? Price floors: a government set minimum that
can be charged for goods and services (ex. Minimum wage
Price Ceiling
Price Floor