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Equilibrium and Disequilibrium Mr. Messere Gr. 12 Economics CIA 4U1.

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Presentation on theme: "Equilibrium and Disequilibrium Mr. Messere Gr. 12 Economics CIA 4U1."— Presentation transcript:

1 Equilibrium and Disequilibrium Mr. Messere Gr. 12 Economics CIA 4U1

2 Outline I. Changes in Equilibrium A. Change in Demand B. Change in Supply C. Change in Both Demand and Supply II. Market Disequilibrium A. Price Floors B.Price Ceilings C.Commodity Agreements

3 Market Dynamics Equilibrium - where quantity demanded equals quantity supplied Equilibrium Price (P*) - price where equilibrium occurs. If price above equilibrium, then surplus occurs If price below equilibrium, then shortage arises

4 Equilibrium/Surplus/Shortage P Q S D E P* Q* 0 Surplus Shortage P1P1 P2P2

5 Equilibrium in the Market What Occurs at Equilibrium? Demand Side - those who get the good are those willing and able (effective demand) to pay the P*. Supply Side - only those firms which are able to produce at or below the cost of P* will remain in business.

6 Changes in Equilibrium Remember that Supply and Demand are drawn under the ceteris paribus assumption. Any factors which cause Supply and/or Demand to change will affect equilibrium price and quantity.

7 Change in Demand Demand will change for any of the non-price determinants examined previously: –Tastes/Preferences –Income –Price of Substitute & Complementary goods –Expectations –Population Ceteris paribus, lets say the demand for CDs increased due to an increase in income. How would this affect market equilibrium price & quantity of CDs?

8 Increase in Demand P Q S CDs D CDs 0

9 Increase in Demand P Q S CDs D CDs E P* Q* 0 D E P*

10 Change in Supply Supply will change for any of the the non- price determinants examined previously: - Costs of Production – Input costs / taxes & subsidies - Technology - Nature and the environment -Number of producers -Complements & substitutes in production Ceteris paribus, lets say that the government lowers taxes on CDs. How would this affect the market equilibrium price & quantity of CDs?

11 Increase in Supply P Q S CDs D CDs 0

12 Increase in Supply P Q S CDs D CDs E P* Q* 0 S E P* Q*

13 Changes in Demand and Supply To determine the impact of both supply and demand changing: First examine what happens to equilibrium price and quantity when just demand shifts. Second, examine what happens to equilibrium price and quantity when just supply changes Finally, add the two effects together.

14 Changes in Demand and Supply General Results: When supply and demand move in the same direction Equilibrium price is indeterminate When supply and demand move in opposite directions Equilibrium quantity is indeterminate

15 Supply & Demand Move in the Same Direction Assume ceteris paribus: Suppose that the barbecue season is at its peak. Also, the price of cattle decreases by 10% during this time. How would this affect the market equilibrium price & quantity of steak?

16 Supply & Demand Move in the Same Direction P Q S Steak D Steak E P* Q* 0 D E1E1 P1P1 Q1Q1 S Q2Q2 E2E2 P?P?

17 Final Equilibrium Quantity & Price when Demand & Supply move in the Same Direction Since it is barbecue season, consumer preference for steak has increased, thus causing demand to increase from D to D. This temporarily pulls up price and increases quantity demanded to P 1 and Q 1 respectively. At the intermediate equilibrium level, E 1, supply then increases from S to S as a result of lower cattle prices (a fall in the price of an input) which pushes the final market equilibrium quantity to E 2 where the final equilibrium quantity is Q 2 and equilibrium price is indeterminate.

18 Supply & Demand Move in Opposite Directions Assume ceteris paribus: Suppose that the price of lemons falls and lemon is considered an essential ingredient in preparing great tasting spinach. At the same time, many spinach farmers also reduce the amount of land used to produce spinach. How would this affect the market equilibrium price & quantity of spinach?

19 Supply & Demand Move in the Opposite Directions P Q S Spinach D Spinach E P* Q* 0 D Q1Q1 P1P1 E1E1 S E2E2 Q? P2P2

20 Final Equilibrium Quantity & Price when Demand & Supply move in Opposite Directions As a result of the price of lemons falling (a complimentary good) the demand for spinach increases from D to D and temporarily raises the price from P* to P 1 and quantity from Q* to Q 1. At the intermediate equilibrium level, E 1, supply then decreases from S to S because there are fewer farmers growing spinach which pushes the final market equilibrium quantity to E 2 where the final equilibrium price is P 2 and equilibrium quantity is indeterminate.

21 The Role of Prices Convey information –When the price of a Maple Leaf ticket increased from $120 last season to $150 this season (on average), it told us something about the popularity of the Maple Leafs Rationiong device –The price is what determines who can have the good

22 Market Disequilibrium Is it possible for the price and quantity to NOT be in equilibrium? Yes - While the invisible hand may move price towards equilibrium, price controls tend to generate disequilibrium in the marketplace

23 Price Controls There are two types of price controls: 1) Price Ceilings 2) Price Floors

24 Price Ceilings Price Ceiling - sets a maximum price that is allowed by law. Result of Price Ceiling: –Stay at a permanent shortage situation Note that a price ceiling can be any price the government chooses. It is, however only effective if it is below the equilibrium price

25 Price Ceiling Example of Price Ceiling Rent controlled apartments In New York City, San Francisco, Boston, and other cities the city or state determines the maximum amount that can be charged for rent on many apartments. A maximum price is a price ceiling

26 Rent Controlled Apartments P Q S D 0

27 P Q S D P* Q* 0

28 Rent Controlled Apartments P Q S D P* Q* 0 P ceiling QsQs QdQd Amount of Shortage

29 Winners and Losers Who gains and loses with price ceilings? 1. Benefit - those who get rent controlled apartments 2. Loses - those who cant find apartments due to the shortage. 3. Loses - landlords who must accept lower rent.

30 Price Floors Price Floor - sets a minimum price that is allowed by law. Result of Price Floor Stay at a permanent surplus situation Note that a price floor can be set at any price, but is only effective if it is above the equilibrium price

31 Price Floors Example of Price Floor Minimum Wage Legislation The minimum wage is a lowest price the government will allow firms to pay for labor. A minimum price is a price floor

32 Price Floors When we look at the labor market it is similar to other supply and demand diagrams except for the labels. L - quantity of workers w - wages (the price we pay workers) It is also different because the suppliers of labor are households, not firms, and the demanders of labor are firms, not households

33 Minimum Wage Legislation Wage # of Workers S D 0

34 Minimum Wage Legislation Wage # of Workers S D w* L* 0

35 Minimum Wage Legislation Wage # of Workers S D w* L* 0 w floor LdLd LsLs Amount of Unemployed Workers

36 Winners and Losers Who gains and loses with price floors? 1. Benefit - those who get higher wages 2. Loses - those who cant find jobs at the higher wage 3. Loses - firms who must pay higher wages.

37 Commodity Agreements Market instability may arise due to: –Fluctuating prices due to changing market conditions –Changing prices due to changes in exchange rates –Changes in foreign government protectionist measures Producers of commodities (eg. coffee, sugar, grains, tin) may cooperate to stabilize the market –eg. prices kept from falling below certain level

38 Production Quota System An agreement by producers to limit the amount supplied to the market place & thus influence price Individual cartel members produce portion of output according to their quota

39 Production Quota System Price S1S1 D S2S2 P1P1 P2P2 Q1Q1 Q2Q2

40 Buffer Stock System Group of producers (with support of govt) set a target price or price band (price floor & ceiling) If market conditions lead to –Shortage (price above target price), buffer stock authority will sell off previously acquired stocks –Surplus (price falls below target price), buffer stock authority will agree to purchase surplus at intervention price

41 Buffer Stock System Price S5S5 D S1S1 P1P1 P4P4 Q5Q5 Q2Q2 Target Band P3P3 P2P2 S4S4 S2S2 Q1Q1 Q4Q4 Q3Q3 S3S3 Shortage Surplus

42 Buffer Stock System - Considerations Surplus can be disposed of in several ways: –Stored for future use Opportunity cost of storage facilities can be prohibitive for producers –Destruction of commodity If food, normative issue arises in light of global poverty & hunger –Selling to other countries If dumped in another country (priced below foreigners own prices in domestic market) can undermine domestic producers in countries where goods sold –Provision as overseas assistance Food aid could lead to dependency culture

43 Further Practice Use the last question page to complete the following. For each question indicate whether: - price increased, decreased or it was indeterminate (impossible to determine) - quantity increased, decreased or it was indeterminate (impossible to determine) Practice Test Practice Test


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