Do Now – How much would you pay for:

Cold

Soda

Sneakers

Sandwich

Cell Phone

Demand

But I want it….

• Demand is the desire to own something, and the ability to pay for it

The Law of Demand

• The Law of Demand says that:– Consumers will

buy more of a good when its price is lower, and less when its price is higher

DemandPrices

Prices Demand

The Sub Effect

• When consumers react to an increase in a product’s price by consuming less of that product and more of a substitute product…– The Substitution

Effect

The Income Effect• Income Effect: the

change in consumption that results when a price increase causes real income to decline

• When prices increase, your limited budget just won’t buy as much as it did in the past - It feels as if you have less money

• Also works when the price goes down – if the price of gas goes down, all of a sudden you feel like you have more money…

Demand Schedule• The law of demand explains how the price

of any item affects the quantity demanded of that item…

• To have a demand for a good, you must be willing and able to buy it at the specified price– Demand means that you want the good, and

can afford to buy it…

Demand Schedule

• Demand Schedule is a table that lists the quantity of a good a person will buy at various prices in a market

Price of a Slice of Pizza

Quantity demanded per day

$1.00 5

$2.00 4

$3.00 3

$4.00 2

$5.00 1

$6.00 0

Market Demand Schedule• Market Demand

Schedule is a table that lists the quantity of a good all consumers in a market will buy at various prices– EX: allows a

pizzeria owner to predict the total sales of pizza at several different prices

Price of a slice of pizza

Quantity demanded per

day

$1. 00 300

$2.00 250

$3.00 200

$4.00 150

$5.00 100

$6.00 50

Sum it up

As the price of a good goes down…

As the price of a good goes up…

Law of Demand

demand goes up. demand goes down.

Substitution

Effect

consumers substitute that good for other goods.

consumers substitute other goods for that good.

Income Effect demand goes up. demand goes down.

Sum it up

• Demand is the desire to have a good and the ability to purchase it

• As a good’s price rises, people demand less of that good; as a good’s price falls, people demand more of that good

• If the price of a good increases, consumers will increase their demand for substitute goods; if the price of a good decreases, consumers will decrease their demand for substitute goods

• Demand schedules show demand for a good across a range of prices

• Demand curves are graphic representations of demand schedules

Get a textbook and answer the following questions.

• What happens to demand for a good when the price increases?

• What is a market demand curve?

• To have demand for a good, what two conditions must be met?

• Describe the difference between the substitution effect and the income effect.