SUPPLY AND DEMAND CHAPTER 2
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1 SUPPLY AND DEMAND CHAPTER 2
2 YOU ARE HERE
3 DEFINITIONS Supply and Demand: the name of the most important model in all economics Price: the amount of money that must be paid for a unit of output Market: any mechanism by which buyers and sellers exchange goods or services Output: the good or service and/or the amount of it sold
4 DEFINITIONS (CONTINUED) Consumers: those people in a market who are wanting to exchange money for goods or services Producers: those people in a market who are wanting to exchange goods or services for money Equilibrium Price: the price at which no consumers wish they could have purchased more goods at that price; no producers wish that they could have sold more Equilibrium Quantity: the amount of output exchanged at the equilibrium price
5 QUANTITY DEMANDED AND QUANTITY SUPPLIED Quantity demanded: how much consumers are willing and able to buy at a particular price during a particular period of time Quantity supplied: how much firms are willing and able to sell at a particular price during a particular period of time
6 CETERIS PARIBUS As I talked about before economists use models to focus on what is most important Models typically hold other variables constant to examine the effect of other variables. For example in looking at the supply and demand for peanut butter we typically hold the price of jelly constant We sometimes use the Latin phrase ceteris paribus which means holding other things equal to identify this case.
7 DEMAND AND SUPPLY Demand is the relationship between price and quantity demanded, ceteris paribus. Supply is the relationship between price and quantity supplied, ceteris paribus.
8 FIGURING OUT THE DEMAND CURVE There are really two different parts to it which are similar One is the extensive margin that is who buys the good The second is the intensive margin or how much of the good each person buys Guell focuses on the intensive margin, but I want to start with the extensive as I think it is easier to think about
9 EXTENSIVE MARGIN Think about something like an ipad where there is really no reason to buy more than one Suppose there are 5 people in the economy and this is what they are willing to pay: Name WTP Jim $200 Jackie $400 Bill $600 Sally $800 Lisa $1000
10 DEMAND CURVE So what does demand look like: At $1200 I sell no ipads At $1000 I sell to Lisa only At $800 I sell At $600 I sell 3 At $400 I sell 4 And at $200 I sell5 P r i c e ipads
11 INTENSIVE DEMAND Now suppose it is just one worker say me I like to go to basketball games (either pro or college) Suppose the seats are all the same, how many games would I go to? At $200 per seat I would probably go to a game At $50 per seat I would probably go to like 4 games a year At $25 I would go to like 15 At $5 I would go to like 20 At $0 I would go to like 20 Thus demand slopes down for me-the larger the price the fewer games I would go to Demand in the economy picks up both the intensive and extensive margin
12 THE LAW OF DEMAND The relationship between price and quantity demanded is a negative or inverse one. This occurs both on the extensive and intensive margin There are 3 reasons to expect it on the intensive margin
13 The Substitution Effect moves people toward the good that is now cheaper or away from the good that is now more expensive If the price of Mobil gas goes up I buy more Amoco
14 The Real Balances Effect When a price increases it decreases your buying power causing you to buy less. If I live in New York and am spending almost all of my money on rent, if rent doubles I have to move into cheaper place because I can t afford my current place any more
15 The Law of Diminishing Marginal Utility The amount of additional happiness that you get from an additional unit of consumption falls with each additional unit. This is what was really going on with my basketball tickets-i like going but I get tired of it if I go to two many games Pretty much any good we can think of has this characteristic
16 Put it all together and we are pretty confident that demand curves slope down p P q Q
17 DETERMINANTS OF DEMAND Taste Income Normal Goods Inferior Goods Price of Other Goods Complement Substitute Population of Potential Buyers Expected Price Excise Taxes Subsidies
18 MOVEMENTS IN THE DEMAND CURVE Determinant Result of an increase in the determinant Result of a decrease in the determinant Taste D shifts right D shifts left Income-Normal Good D shifts right D shifts left Income-Inferior Good D shifts left D shifts right Price of Other Goods-Complement D shifts left D shifts right Price of Other Goods-Substitute D shifts right D shifts left Population of Potential Buyers D shifts right D shifts left Expected Future Price D shifts right D shifts left Excise Taxes D shifts left D shifts right Subsidies D shifts right D shifts left
19 Example: Demand for Eating Out When Income Falls p P q2 q1 At a given price people eat out less Times Eating Out
20 Example: Demand for ketchup when the price of beef falls p P q1 q2 At a given price the Ketchup People want more Ketchup
21 A PITFALL: CONFUSING MOVEMENT ALONG VS. SHIFTS IN DEMAND Price changes cause movements along a demand curve. Other factors will cause shifts in demand. These are not the same The Quantity Demanded can change either because the price changes or because the demand curve changed
22 Two ways that Quantity Demanded can Increase: P Q
23 SUPPLY Supply is more complicated and harder to think about than demand (at least for me) In demand for an ipad a person buys an ipad and brings it home In supply for an ipad you have to design it, buy all the components, build it, ship it, sell it in the store The Law of Supply is the statement that there is a positive relationship between price and quantity supplied. If I am trying to sell something, the higher is the price the more I will want to sell
24 WHY DOES THE LAW OF SUPPLY MAKE SENSE? Because of Increasing Marginal Costs firms require higher prices to produce more output. Because many firms produce more than one good, an increase in the price of good A makes it (at the margin) more profitable so resources are diverted from good B to produce more of good A (think about the PPF)
25 THE SUPPLY SCHEDULE Price Individual Q s Q S for 10 firms $ $ $1.00 1,000 10,000 $1.50 2,000 20,000 $2.00 3,000 30,000 $2.50 4,000 40,000
26 THE SUPPLY CURVE P $2.50 Supply $2.00 $1.50 $1.00 $ Q (in thousands)
27 MOVEMENTS IN THE SUPPLY CURVE Determinant Result of an increase in the determinant Result of a decrease in the determinant Price of Inputs S shifts left S shifts right Technology S shifts right S shifts left Price of Other Potential Outputs S shifts left S shifts right Number of Sellers S shifts right S shifts left Expected Future Price S shifts left S shifts right Excise Taxes S shifts left S shifts right Subsidies S shifts right S shifts left
28 NUMBER OF SELLERS GOES UP P $2.50 At a given price quantity supplied will increase $2.00 $1.50 $1.00 $ Q (in thousands)
29 PRICE OF AN INPUT GOES UP P $2.50 At a given price quantity supplied will decrease $2.00 $1.50 $1.00 $ Q (in thousands)
30 MARKET EQUILIBRIUM A competitive market is in equilibrium when price has moved to a level at which quantity demand equals quantity supplied of that good. Competitive markets have many buyers and sellers and none is large enough to individually affect the price. Why do markets reach an equilibrium? If prices are too high, there is excess supply (a surplus) and firms will lower prices. If prices are too low, there is excess demand (a shortage) and firms will raise prices.
31 A COMBINED SUPPLY AND DEMAND SCHEDULE Price Q D Q S Shortage Surplus $ , ,000 $ , ,000 $ ,000 10,000 20,000 $ ,000 20,000 $ ,000 30,000 20,000 $ ,000 40,000
32 THE SUPPLY AND DEMAND MODEL $2.50 P $2.00 $1.50 Supply Equilibrium $1.00 $0.50 Demand Q (in thousands)
33 WHAT IF PRICE TOO HIGH? $2.50 P $2.00 $1.50 $1.00 $0.50 Surplus Supply Demand Q (in thousands)
34 WHAT IF PRICE TOO LOW? $2.50 P $2.00 Supply $1.50 $1.00 $0.50 Shortage Demand Q (in thousands)
35 WHAT IF PRICE OF A SUBSTITUTE INCREASES? $2.50 $2.00 P $1.50 $1.00 $0.50 Supply New Equilibrium Old Equilibrium New Demand Demand Q/t
36 Demand Increases Prices Increase Quantities Increase
37 WHAT IF GOOD GETS BAD REVIEWS? $2.50 $2.00 P $1.50 $1.00 Supply New Equilibrium Old Equilibrium $0.50 Demand 0 New Demand Q/t
38 Demand Increases Prices Increase Quantities Increase Demand Decreases Decrease Decrease
39 TECHNOLOGY IMPROVES $2.50 P $2.00 $1.50 $1.00 Supply New Supply Old Equilibrium New Equilibrium $0.50 Demand Q/t
40 Demand Increases Demand Decreases Prices Supply Increases Fall Increase Decrease Quantities Increase Decrease Increases
41 AN INCREASE IN COST OF AN INPUT $2.50 P $2.00 $1.50 $1.00 New Supply Supply New Equilibrium Old Equilibrium $0.50 Demand Q/t
42 Demand Increases Demand Decreases Prices Increase Decrease Supply Increases Decrease Quantities Increase Decrease Increase Supply Falls Increase Decrease
43 WHY THE NEW EQUILIBRIUM? If there is a change in supply or demand then without a change in the price of the good, there will be a shortage or a surplus. Suppose the cost of an input increased-firms would no longer be willing to sell at the same price They raise prices As a result consumers purchase less
44 AN INCREASE IN COST OF AN INPUT $2.50 P $2.00 $1.50 $1.00 New Supply shortage Supply As a result of the shortage, employers can raise prices to new equilibrium where shortage goes away $0.50 Demand Q/t
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