Notes
Slide Show
Outline
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How much will a person pay for an item?
  • It all depends how much
  • UTILITY
  • It has for them.
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"When you’re craving chocolate"
  • When you’re craving chocolate, how much is a Hershey bar worth?
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"The addition of each new..."
  • The addition of each new unit of a good or service brings less satisfaction or utility than the one before.


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A Demand Schedule to
Show the demand for an item at various prices.
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Reading a Demand Schedule
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Now, YOU create a demand curve for togos.
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What Is the Law of Demand?
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"They will get less utility/satisfaction..."
  • They will get less utility/satisfaction for their money when price rises.


  • They may find another product or service for less opportunity cost if the price rises.
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The Demand Schedule
  • A demand schedule is a table that lists the quantity of a good a person will buy at each different price.
  • A market demand schedule is a table that lists the quantity of a good all consumers in a market will buy at each different price.
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Does it look like this?
  • A demand curve is a graphical representation of a demand schedule.
  • When reading a demand curve, assume all outside factors, such as income, are held constant.
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Quantity Demanded (Qd)
  • Is shown as one point on the demand line that shows how much of a good or service will be purchased at that certain price.
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"According to this demand graph"
  • According to this demand graph, what happens to the Qd of pizza rolls when the price changes from $2 to $3?
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"Ceteris paribus is a Latin..."
  • Ceteris paribus is a Latin phrase economists use meaning “all other things held constant,” besides price.
  • The law of demand is accurate only as long as the ceteris paribus assumption is true.
  • Ceteris paribus explains change in quantity demanded (Qd) when price changes.  It is movement along ONE demand curve.
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But what about situations where demand changes for reasons other than price?
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Shifts in Demand

  • When the ceteris paribus assumption is dropped, movement no longer occurs along the demand curve.
  • Rather, the entire demand curve shifts.
  • It looks like this.
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Demand shifts…...
  • To the LEFT if it decreases.
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Demand shifts…...
  • To the Right if it increases.
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"Show the shift in demand..."
  • Show the shift in demand for pizza rolls at Lake Superior pizza after subway opens a shop nearby using the data on this demand schedule.
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Demand shifts…...
  • To the LEFT if it decreases.
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What factors cause a shift in demand?
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1. Changes in population
  • When population increases, demand also usually increases.
  • When population falls, demand decreases.
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When K.I.Sawyer closed...
  • The population dropped in Marquette County and less meals were served at local restaurants.
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2. Changes in Income
  • INCOME: Changes in consumers incomes affect demand.


  • If incomes riseand prices remain the same demand will increase.
    • If income falls and prices remain the same, demand will decrease.
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When people received their tax refunds...
  • The demand for movie tickets increased at GKC.
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When incomes go down, the demand for inferior goods rises.
  • A normal good is a good that consumers demand more of when their incomes increase. An inferior good is a good that consumers demand less of when their income increases.


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3.  Changes in taste and preference.
  • What people like determines what they buy.
  • As items become popular, demand rises.
  • As items lose popularity, demand falls.
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When CD’s produced better quality recordings than cassettes...
  • The demand for CDs increased.
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When Oprah discussed mad cow disease on her show...
  • The demand for beef decreased significantly.
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5. Complementary Goods
  • When two goods are complementary products, the rise in the price of one, will lower the demand for its complement.
  • Or,the fall in a price of one will increase the demand for its complement.
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When farmers had a record year for tomatoes and the price of spaghetti sauce decreased...
  • The demand for pasta increased.
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4. Availability of Substitutes
  • Substitution is the availability of similar items to satisfy the same need if the price of one rises, people will buy the other one.
    • Example:  If the price of butter goes up, people will buy margarine instead...OR...if the price of going to the movies goes up, people will stay home and rent videos instead.
    • If income goes up, sometimes people with buy the higher priced items.
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When the price of movie tickets  increased...
  • The demand for video rentals increased.
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"How will a change in..."
  • How will a change in price affect demand?
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What Is Elasticity of Demand?
  • Demand for a good that consumers will continue to buy despite a price increase
    is inelastic.
  • Demand for a good that is very sensitive to changes in price is elastic.
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"Demand"
  • Demand, raise your right hand!  (Clap, clap)


  • Supply, let your left hand fly! (Clap, Clap)
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"What is the law of..."
  • What is the law of supply?
  • What are supply schedules and supply curves?
  • What is elasticity of supply?
  • What factors affect elasticity of supply?
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Supply
  • The willingness and ability to provide goods and services at different prices.
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At a price of $.10 each…
  • How many cookies would you be willing to bake to sell?
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What if the price was $.50 per cookie…
  • Now, how many would you be willing to sell?
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Just say, cookies were selling for $1.00 each…
  • Now how many would you be willing to bake to sell?
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Law of Supply
  • Generally:
    • as $ rises;  the quantity supplied rises.
    • as $ falls; the quantity supplied falls.
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Supply Schedule
  •              $                Quantity
    •          5.00                  5 million
    •          4.00      4 million
    •          3.00                   3 million
    •          2.00                   2 million
    •          1.00                  1 million
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Law of Supply
  • Generally:
    • as $ rises;  the quantity supplied rises.
    • as $ falls; the quantity supplied falls.
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Supply Curve
  •  $
    •  5
    •  4
    •  3
    •  2
    •  1
    •  0
    •      1       2        3        4         5         6       7       8                       (millions of pieces of pizza)
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Change in Quantity Supplied
  • When the pizza went from $3.00 to $4.00 per slice; the quantity supplied changed from 3 million to 4 million, because more pizza suppliers wanted to produce pizza to sell at the higher price.


  • Change in price changes quantity supplied.
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Change in quantity supplied…
  • Is always due to
  • PRICE
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Supply Curve
  •  $
    •  5
    •  4                            S2
    •  3               S1
    •  2
    •  1
    •  0
    •      1       2        3        4         5         6       7       8
      •    (millions of pieces of pizza)
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Practice:  Create a supply curve for this supply schedule.
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Show a change in quantity supplied as price changes from $1.00 to $2.00.
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Market Supply schedule
(combined firms)
Draw this curve…
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Show how quantity supplied changes with price change from $2.00 to $3.00.
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"How quickly will quantity supply..."
  • How quickly will quantity supply change when price changes?
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Shift in Supply happens when:
  • 1.  Firms enter or leave the market
  • 2.  Input costs change
  • 3.  Technology costs
  • 4.  Subsidies by the government
  • 5.  Taxes
  • 6.  Regulations by the government
  • 7.  Expectations of future prices
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Change in supply looks like this…
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Supply Curve Change:  Firms enter/exit the industry.  Two new pizza places open in Marquette.
  •  $
    •  5
    •  4
    •  3
    •  2
    •  1       S1
    •      1       2        3        4         5         6       7       8
    • After the new pizza shops open how many pizzas will be supplied at $4.00 compared to before?

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Supply Curve Change: Input cost  Flour prices increase and it now costs more to produce pizza.
  •  $                       S2
    •  5
    •  4
    •  3
    •  2
    •  1       S1
    •      1       2        3        4         5         6       7       8
      •      (millions of pieces of pizza)
    • After the flour price increase, how many slices of pizza will be supplied  at $4.00 compared to before?
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Supply Curve Change:Technology    A new crust maker allows 1 employee to make twice as many pizzas as before in the same amount of time.(S3)
  •  $
    •  5
    •  4
    •  3
    •  2
    •  1       S1
    •      1       2        3        4         5         6       7       8
    • After the new technology how many pizzas will be supplied at $4.00 compared to before?

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Supply Curve Change:  Subsidies 
The government pays dairy farmers $.25 for every gallon of milk they produce.
  •  $
    •  5
    •  4
    •  3
    •  2
    •  1       S1
    •      1       2        3        4         5         6       7       8
    • After the subsidy, how many  be supplied at $4.00 compared to before?

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Supply Curve Change: Taxes
The government levies a tax on all foreign steel, including that used by Ford for their vehicles.
  •  $
    •  5
    •  4
    •  3
    •  2
    •  1       S1
    •      1       2        3        4         5         6       7       8
    • After the new tax, what will happen to the supply of new Ford cars?

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Supply Curve Change: Expectations of future prices.
Due to the hurricane in Florida, the orange crop in many areas was destroyed.
  •  $
    •  5
    •  4
    •  3
    •  2
    •  1       S1
    •      1       2        3        4         5         6       7       8
    • After the announcement of this news, what will happen to the market for frozen orange juice?

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"Demand"
  • Demand, raise your right hand!  (Clap, clap)


  • Supply, let your left hand fly! (Clap, Clap)


  • Cross both of them,
  • To find equilibrium!
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Supply and Demand Together
  • The Story of Sam the Supplier
  • and Conrad the Consumer
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Sticks selling at $20.00
  • Hi Sam,
  • I’ll take two hockey sticks @ $20.00 each.
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Graph looks like this.
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Sam decides to raise price to $25
  • Sorry, Sam.
  • I planned to buy another hockey stick, but at that price, I’m going to go to another store, cause I know I can get it cheaper there.
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Graph looks like this.
(Change in quantity supplied from A to B
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Graph looks like this.
(Change in quantity supplied from A to B
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Sam drops his price back to $20 to stay competitive.
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Everyone gets raises
(Change in demand due to change in income)
  • Sam,
  • We all got raises at work, so I’ll take four sticks. (Income)
  • Sorry, Conrad,
  • I’ve run out of sticks.  So many people are buying them, I can’t keep enough on the shelves.
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Graph looks like this.
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(As demand goes up, a shortage results, which then drives the equilibrium price up.
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                               $
  • Wow,
  • With the price that high, I am going to find more sticks to sell.
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Graph looks like this.
Sam increases production, and other stores do also, so the supply shifts to the right as more are produced.
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As supply shifts right, equilibrium price (EP) falls, so Sam can sell more sticks, but has to reduce his price.
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Supply & Demand together: 
Tacos become popular and pizza demand falls.
  •  $
    •  5                            S1
    •  4
    •  3
    •  2 1
    •  0
    • 1       2        3        4         5         6       7       8
    • (millions of pieces of pizza)
    • What happens to price?
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Supply&Demand together:  Bad year for tomatoes increases cost of pizza sauce.
  •  $
    •  5                    S2
    •  4
    •  3
    •  2
    • 0
    • 1       2        3        4         5         6       7       8                       (millions of pieces of pizza)
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Supply&Demand together:What will happen if technology produces cheaper baking costs for pizza ovens???
  •  $
    •  5                    S1
    •  4
    •  3
    •  2
    •  1
    •  0
    •        1       2        3        4         5         6       7       8                       (millions of pieces of pizza)
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Supply&Demand together:Now suppose demand for pizza skyrockets as Marquette’s population increases when a factory is set up at the air base.
  •  $
    •  5
    •  4
    •  3
    •  2
    •  1


    •      1       2        3        4         5         6       7       8                       (millions of pieces of pizza)
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"Page 127"
  • Page 127
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"Are enacted when the government..."
  • Are enacted when the government thinks that prices are unfair to buyers or sellers.



  • Example:  When rents are so high a group of people cannot afford housing.
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"The maximum price that can..."
  • The maximum price that can be charged for a good or service.
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Price Ceilings can create shortages.
  • A shortage exists when demand is greater than supply.
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"…when the government requires..."
  • …when the government requires a minimum amount be paid for a good or service.


  • A surplus exists when supply is greater than demand.


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"When you’re craving chocolate"
  • When you’re craving chocolate, how much is a Hershey bar worth?
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"The addition of each new..."
  • The addition of each new unit of a good or service brings less satisfaction or utility than the one before.