1. Who do you think has more power in the marketplace,
Warm-up
Who do you think has more power in the marketplace,
the buyer or the seller?
Why?

2. Chap. 6 Sect. 2 Combining Supply and Demand
Goals:
5. Explain how supply and demand create balance in the market.
6. Explain how the market reacts to a fall in supply by moving to a new equilibrium.
7. Explain how elasticity of demand creates a wider range of prices possible in reaction to shifts in supply.
8. Explain how the market reacts to shifts in demand by moving to a new equilibrium.

3. Supply and Demand
The Market System makes certain that: - buyers can find the products they want -sellers are able to make a profit -sellers respond to changing wants/needs of buyers Supply and Demand work together bringing competing interests of buyers and sellers to a positive outcome

4. Balancing the Market Equilibrium Price-
Market Equilibrium – When the market’s qty supplied and qty demanded are equal to each other and prices are relatively stable. At equilibrium the market is balanced.
Equilibrium Price-
The price of a good
which clears the market
of all goods without leaving a shortage or a surplus.
At that price - buyers will buy exactly the qty that sellers are willing to supply.

5. Putting Supply and Demand Together!!!
(I know you’ve been waiting your whole life for this moment!)

6. What if the price increases to $3?
Supply and Demand are put together to determine equilibrium price and equilibrium quantity
Supply Schedule
Demand Schedule
What if the price
increases to $3? P
Qty $3
350
$2.50
300 $2
250
$1.50
200 $1
150
$.50
100 P
Qty $3 50
$2.50
100 $2
150
$1.50
200 $1
250
$.50
300
Equilibrium Price = $1.50
Equilibrium Qty = 200

7. Supply and Demand are no longer equal-
Qty Supplied > Qty Demanded = Surplus
Supply Schedule
Demand Schedule P
Qty $3
350
$2.50
300 $2
250
$1.50
200 $1
150
$.50
100 P
Qty $3 50
$2.50
100 $2
150
$1.50
200 $1
250
$.50
300
New Price = $3
Surplus = 300
(QS-QD) = Surplus

8. What if the price decreases to $1?
Disequilibrium cont.
Surplus– occurs when qty supplied exceeds qty demanded. (AKA excess supply) Higher prices encourage sellers to provide more, but keeps buyers from buying – so there are a lot of left-overs. When there is a surplus, the sellers will lower prices and make less, gradually decreasing supply while increasing demand and equilibrium will be reached.
What if the price
decreases to $1?

9. Supply and Demand again not equal-
Qty Demanded > Qty Supplied = Shortage
Supply Schedule
Demand Schedule P
Qty $3
350
$2.50
300 $2
250
$1.50
200 $1
150
$.50
100 P
Qty $3 50
$2.50
100 $2
150
$1.50
200 $1
250
$.50
300
New Price = $1
Shortage = 100
(QD-QS = Shortage

10. Disequilibrium When sellers see the # of people willing to buy, they
-any point when qty supplied is not equal to qty demanded.
Shortage– occurs when qty demanded is more than qty supplied. (AKA excess demand)
Lower prices encourages buyers to buy, but discourages sellers to provide products
When sellers see the # of people willing to buy, they
will gradually raise their prices and supply more
as prices go up- less people
will be willing to pay and eventually equilibrium is reached

11. Markets and Equilibrium
Market Forces will always push an unbalanced market towards equilibrium. Sellers do not want to waste resources by throwing out surplus goods. Sellers will also see excess demand as an opportunity to increase profits by raising prices. Sellers will change their prices and qty supplied in response to the buyers level of demand.

12. How to Analyze Shifting Supply and Demand Curves
Assume shifts in supply or demand change equilibrium P and Q instantaneously

13. Easy as 1, 2, 3 Let’s Practice! Before the change: The change:
Draw supply and demand
Label original equilibrium price and quantity
The change:
Did it affect supply or demand first? (The answer is in the story)
What caused the shift?
Draw increase or decrease
After change:
Label new equilibrium?
What happens to Price? (increase or decrease)
What happens to Quantity? (increase or decrease)
Let’s Practice!

14. Analyze Hamburgers S&D Analysis Practice
Before Change (Draw equilibrium)
The Change (S or D, Identify Shifter)
After Change (Price and Quantity After)
Analyze Hamburgers
Price of sushi (a substitute) increases
New grilling technology cuts production time in half
Price of burgers falls from $3 to $1.
Price for ground beef triples
Human fingers found in multiple burger restaurants.

15. Double Shifts
Suppose the demand for sports cars fell at the same time as production technology improved.
Use S&D Analysis to show what will happen to PRICE and QUANTITY.
If TWO curves shift at the same time, EITHER price or quantity will be indeterminate

16. Effects of Demand Elasticity
When a supply shift happens and the good has inelastic demand, the change in qty demanded will be very small relative to the original data.
When a supply shift happens and the good has elastic demand, the change in qty demanded will be much larger relative to the original data.