Download - Goal 8 supply and demand
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Laws of Demand
Goal 8
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Discuss
What is a market? In a market who is the
consumer? How does the price of a
good affect the consumer?
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Market
An arrangement that allows buyers and sellers to exchange things
Markets exist because no one is self sufficient and no one produces all we require to satisfy all our needs and wants.
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Demand
Description› The quantities of a particular good or service consumers are willing and able to buy at different possible prices at a particular time
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Demand Illustration p.1 sec. 1
Price
Quantity
As price goes up, quantity goes down
D1
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Discuss
How does demand and “want” or “desire” differ?
You may want or desire a new car or a closet full of clothes, but you demand these things only when you are willing and able to buy them.
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Quantity Demand
The quantities of a particular good or service consumers are willing and able to buy at set prices at a particular time
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Quantity Demand Illustration
D2
Price
Quantity
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Demand Schedule
How much people are going to buy at the various prices.
Ex. The price of pizza
Price Quantity
$.50
$1.00
$1.50
$2.00
$2.50
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Law of Demand
As price goes up quantity goes down
As price goes down quantity goes up
People buy less of something at higher prices than they do at lower prices.
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ELASTIC DEMAND: demand that is very sensitive to a
change in price goods that one might stop buying
or cut back on as price increased (SUVs, Luxury items)**on a graph this demand curve will be FLAT
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INELASTIC DEMAND
demand that is not very sensitive to a change in price
goods that you would buy at any price; there are few if any substitutes for these goods.
(milk, gas, prescription drugs) **on a graph this demand curve would be very steep.
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Illustration of Decrease and Increase in Demand Decrease in Price Increase in Price
Price
Quantity
D1 D2
Quantity
Price
D1D2
The less you buy the more you will move to the left!
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The Demand Curve
The Demand Curve slopes downward to the right because the consumer is willing and able to buy more gasoline at lower prices than at higher prices.
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Scenario #1
Harris Teeter is advertising a sale on hot dog buns. What is the impact on the demand for hot dogs?
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Scenario #2
Playstation 3, the newest video game console, hits stores. What is the impact on the demand for Xbox 360?
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Scenario #3
The weatherman forecasts rain for the weekend in Charlotte. What is the impact on the demand for umbrellas?
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Scenario #4
The N.C. General Assembly increases minimum wage to $7/hour. What is the impact on the demand for clothing?
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Scenario #5
A snowy blizzard blows through Charlotte. What is the impact on the demand for snow boots?
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Scenario #6
The price of MP3 players decreases dramatically due to new technology. What is the impact on the demand for portable CD players?
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Scenario #7
Summertime is approaching. What is the impact on the demand for shorts?
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Scenario #8
The price of hamburgers increases at Food Lion. What is the impact on the demand for French fries?
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Changes in Demand
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Reasons Demand can change
People’s Income Weather Complementary Goods Substitute Goods
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What is a Complementary Good?
Complementary Good: Two goods that are usually consumed together (Hot Dogs & buns)
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What is a Substitute Good?
Substitute Good: An acceptable replacement for a good (Playstation & Xbox)
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People’s Income Increases
Effect on Demand
Demand Increases› (shift right)
P
Q
D1 D2
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Bad Weather (for product)
Effect on Demand
Demand Decreases› (shift left)
P
Q
D1D2
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Price of Complementary Good Decreases (ex: peanut butter & jelly)
Effect on Demand
Demand Increases› (shift right)
P
Q
D1 D2
Peanut Butter
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Price of Substitute Good Decreases (ex: Pepsi & Coca-Cola)
Effect on Demand
Demand Decreases› (shift left)
P
Q
D1D2
Pepsi
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Complementary vs. Substitute
Can YOU tell the difference????
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Substitute
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Complementary
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Substitute
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Complementary
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Substitute
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Substitute
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Complementary
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Elasticity of Demand
How much the quantity demanded will change if the price rises or falls.