Demand

How much will you pay for my ipod?

(Reference 3.1 and 3.2 )(Reference 3.1 and 3.2 )

• Fans often complain that athletes get paid too much money and that these higher salaries lead to higher ticket prices.

1.1. Do you agree or disagree with this statement?Do you agree or disagree with this statement?• Higher ticket prices lead to lower sales. Higher ticket prices lead to lower sales.

2.2. Why does this happen?Why does this happen?3.3. Why would they raise ticket prices?Why would they raise ticket prices?

• If the Chargers sell 20,000 tickets at $25 and only sell 12,000 at $30, which ticket price brings in more total revenue?

• If players salaries go up from $300,000 to $325,000 per game what price would Chargers sell tickets at? The attendance numbers from above still apply.

• What do you think might cause ticket prices to go up?

What is a market?

• markets are places where 1 or more buyers and 1 or more sellers come together

• ex: swap meet, stock market, grocery store, E-Bay

– good is a tangible item [product] that gives a person utility or satisfaction

– service is an intangible item that gives a person utility or satisfaction

utility = usefulness

Markets have 2 parts

• BuyersBuyers provide the DemandDemand

• SellersSellers provide the SupplySupply

What is demand?

• Demand- is the willingness and ability to purchase a good or service.– willingness to purchase refers to a person’s want or

desire for a good– ability to purchase means having the money to pay for

the good.

• You may want something but may not have the ability to pay for it.

• There is no demanddemand unless BOTH BOTH components are there.

The Law of Demand• Law of Demand

– as the price (P) of a good increases, the quantity demanded (QD) of the good decreases

– as the price of a good decreases, the quantity demanded increases

• Quantity Demanded (QD)

– the number of units of a good purchased at a specific price

Inverse Relationship between P and QD

P QD P QD

Why is this true?

Law of Demand• When price rises, quantity demanded falls• When price falls, quantity demanded rises

Because . . .

…of the

Law of Diminishing Marginal Utility

Law of Diminishing Marginal Utility

utility = usefulness

With your partner, please read p. 68“A Day at Disneyland…” and answer

the question below

• Can you think of a good or service that is priced the way visits to Disneyland are priced? (For two units of the good or service, you pay less than double what you pay for one unit)

This pricing illustrates the Law of Diminishing Marginal UtilityThis pricing illustrates the Law of Diminishing Marginal Utility

Economists like to use graphs to represent changes in demand

Demand Schedulea numerical chart that shows the law of demand

Price Quantity Demanded

$4

$3

$2

$1

1

2

3

4

Check out what we did with the ipod?Check out what we did with the ipod?

Demand Curvea graphic representation of the law of demand

Price Quantity Demanded

$4

$3

$2

$1

1

2

3

4

Demand

0

1

2

3

4

5

1 2 3 4

Quantity DemandedP

rice

Let’s convert the ipod demand schedule to a demand curve.

Conduct a poll of your classmates in order to develop a demand schedule and a demand curve

• Think of a product and a reasonable price range. Ask at least 10 students at what price they would buy that product.

Record the info in a demand schedule

Price Quantity demanded

Then plot the info on a graph

• Demand increases DC shifts Right

• Demand decreases DC shifts left

What causes demand curves to shift?What causes demand curves to shift?

Shifts in Demand Curves

Now the ipod not only has all its original features,but also has all the

answers to your homework in a print format

• How will that change the demand curve?

• Can you predict other things that might cause a demand curve to shift?

What What causescauses demand curves to demand curves to shiftshift??

• PreferencesPreferences

• Number of BuyersNumber of Buyers

• IncomeIncome

• Price of Related GoodsPrice of Related Goods

Buyers demand more or less of a good at all prices

IncomeIncome may shift demand curve

• If income increases and…

– More of a good is demanded: NORMAL GOOD

– Less of the good is demanded: INFERIOR GOOD

– Neither more or less of the good is demanded: NEUTRAL

GOOD

Price of Related Goods

• 2 types of related goods

– Substitutes Substitutes – Coke for Pepsi

» Price increase for Coke—demand increase for Pepsi

– ComplementsComplements– Peanut Butter and Jelly

» Price increase for pb—demand decrease for j

Caution!Caution!

Change of Demand (movement of demand curve)

IS NOT THE SAME ASIS NOT THE SAME AS

Change in Quantity Demanded(change along the line-based only on change in price

Homework:

• Review Chapter 3.1 and 3.2 pages 66 to 76. Read and consider Sec. Review Qs p.70 & 76. Surprise Quiz next class.

• Complete “Cheezy Doodle” H/O