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C H A P T E R 6
Demand, Supply, & Prices
The Interaction of Demand and Supply
 Market equilibrium: Quantity demanded is equal to
quantity supplied
 Equilibrium price: is the price where the market is at
equilibrium.
E
D1
S1
Reaching the Equilibrium Price
 Surplus: results when quantity supplied is greater
than quantity demanded.
 This will be found above the equilibrium point on a graph
 Shortage: when quantity demand exceeds quantity
supplied.
 This will be found below the equilibrium point on a graph.
Reaching the Equilibrium Price
1
2
3
4
5
6
7
1 2 3 4 5 6 7 8
Price
Quantity
Surplus
Shortage
D1
S1Amount demanded
Amount supplied
Holiday Toys
 Think of the hot Holiday toy around Christmas time,
there is often a shortage of the toy during the holiday
shopping spree. After the holiday there may be a
surplus.
Change in Demand and Equilibrium Price
 Disequilibrium: occurs when quantity demanded
and quantity supplied are not balanced.
D1
D2
Quantity
Price D3A decrease in demand
results in a drop in
equilibrium price
An increase in demand
results in an increase in
equilibrium price
E
Change in Supply and Equilibrium Price
Quantity
price
S1
S2
S3
e
A decrease in Supply results
in an increase in Price
An increase in supply results
in a decrease in price
S E C T I O N 2
Price as Signals and incentives
How the Price System Works
 Competitive pricing: occurs when producers sell
products at lower prices to lure customers away from
rival producers, while still making a profit.
How the Price System Works
 It’s neutral: the free interaction between producers
and consumers determines equilibrium price.
 It’s market driven: price system runs it’s self, not
a government.
 It is flexible: when conditions change, prices are
able to change quickly in response
 It’s efficient: prices will adjust until maximum
number of goods and services are sold.
Prices Motivate Producers and Consumers
 Incentive: is a way to encourage people to take a
certain action.
 What incentives affect producers?
 What incentives affect consumers?
S E C T I O N 3
Intervention in the Price
System
Imposing Price ceilings
 Price ceiling: the legal maximum price that sellers
may charge for a product.
 Price ceilings result in shortages. They are set below the
equilibrium price.
 Rent control
 Football tickets
Price Ceiling
e
Price Ceilings
 Why do you think colleges don’t raise prices on
football tickets?
 What about concert tickets that sell out?
Setting Price Floor
 Price Floor: the legal minimum price that buyers
must pay for a product.
 Are set above the equilibrium price. They create a surplus.
 Minimum wage
Price floor
e
Minimum wage
 What do you think would happen if we increased
minimum wage?
 What businesses might be hurt by this most?
 http://www.stltoday.com/business/columns/david-nicklaus/nicklaus-seattle-experiment-should-prove-the-perils-of-a-
higher/article_77c530f1-c87e-5b81-b414-7805913a9c3d.html
Rationing Resources and Products
 Rationing often takes place during war time, it is
done on a first come first serve basis.
 Black markets are a product of the rationing system
where rationed items go to the highest bidder.
Demand Factors Supply factors
 Market size
 Income
 Consumer expectations
 Substitute goods
 Complementary goods
 consumer taste
 Forces of nature
 # of producers
 Producer expectations
 Labor productivity
 Government action
 Input cost
 Technology
Factors that affect Supply and Demand
Calculating Surplus or Shortage
 Consumer surplus= buyers max-price
 Producer surplus= price –sellers max

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Demand, supply, & prices (1)

  • 1. C H A P T E R 6 Demand, Supply, & Prices
  • 2. The Interaction of Demand and Supply  Market equilibrium: Quantity demanded is equal to quantity supplied  Equilibrium price: is the price where the market is at equilibrium. E D1 S1
  • 3. Reaching the Equilibrium Price  Surplus: results when quantity supplied is greater than quantity demanded.  This will be found above the equilibrium point on a graph  Shortage: when quantity demand exceeds quantity supplied.  This will be found below the equilibrium point on a graph.
  • 4. Reaching the Equilibrium Price 1 2 3 4 5 6 7 1 2 3 4 5 6 7 8 Price Quantity Surplus Shortage D1 S1Amount demanded Amount supplied
  • 5. Holiday Toys  Think of the hot Holiday toy around Christmas time, there is often a shortage of the toy during the holiday shopping spree. After the holiday there may be a surplus.
  • 6. Change in Demand and Equilibrium Price  Disequilibrium: occurs when quantity demanded and quantity supplied are not balanced. D1 D2 Quantity Price D3A decrease in demand results in a drop in equilibrium price An increase in demand results in an increase in equilibrium price E
  • 7. Change in Supply and Equilibrium Price Quantity price S1 S2 S3 e A decrease in Supply results in an increase in Price An increase in supply results in a decrease in price
  • 8. S E C T I O N 2 Price as Signals and incentives
  • 9. How the Price System Works  Competitive pricing: occurs when producers sell products at lower prices to lure customers away from rival producers, while still making a profit.
  • 10. How the Price System Works  It’s neutral: the free interaction between producers and consumers determines equilibrium price.  It’s market driven: price system runs it’s self, not a government.  It is flexible: when conditions change, prices are able to change quickly in response  It’s efficient: prices will adjust until maximum number of goods and services are sold.
  • 11. Prices Motivate Producers and Consumers  Incentive: is a way to encourage people to take a certain action.  What incentives affect producers?  What incentives affect consumers?
  • 12. S E C T I O N 3 Intervention in the Price System
  • 13. Imposing Price ceilings  Price ceiling: the legal maximum price that sellers may charge for a product.  Price ceilings result in shortages. They are set below the equilibrium price.  Rent control  Football tickets Price Ceiling e
  • 14. Price Ceilings  Why do you think colleges don’t raise prices on football tickets?  What about concert tickets that sell out?
  • 15. Setting Price Floor  Price Floor: the legal minimum price that buyers must pay for a product.  Are set above the equilibrium price. They create a surplus.  Minimum wage Price floor e
  • 16. Minimum wage  What do you think would happen if we increased minimum wage?  What businesses might be hurt by this most?  http://www.stltoday.com/business/columns/david-nicklaus/nicklaus-seattle-experiment-should-prove-the-perils-of-a- higher/article_77c530f1-c87e-5b81-b414-7805913a9c3d.html
  • 17. Rationing Resources and Products  Rationing often takes place during war time, it is done on a first come first serve basis.  Black markets are a product of the rationing system where rationed items go to the highest bidder.
  • 18. Demand Factors Supply factors  Market size  Income  Consumer expectations  Substitute goods  Complementary goods  consumer taste  Forces of nature  # of producers  Producer expectations  Labor productivity  Government action  Input cost  Technology Factors that affect Supply and Demand
  • 19. Calculating Surplus or Shortage  Consumer surplus= buyers max-price  Producer surplus= price –sellers max