Lecture 3 The Market Forces of Supply and Demand (Ch4)
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1 Lecture 3 The Market Forces of Supply and Demand (Ch4)
2 In this chapter, look for the answers to these questions What factors affect buyers demand for goods? What factors affect sellers supply of goods? How do supply and demand determine the price of a good and the quanhty sold? How do changes in the factors that affect demand or supply affect the market price and quanhty of a good? How do markets allocate resources? 2015 Cengage Learning. All Rights Reserved. May not be copied, scanned, or duplicated, in whole or in part, except for use as permitted in a license distributed with a certain product or service or otherwise on a password-protected website for classroom use.
3 Markets and CompeHHon A market is a group of buyers and sellers of a parhcular product. A compe**ve market is one with many buyers and sellers, each has a negligible effect on price. In a perfectly compe**ve market: All goods exactly the same Buyers & sellers so numerous that no one can affect market price each is a price taker In this chapter, we assume markets are perfectly compehhve.
4 Demand The quan*ty demanded of any good is the amount of the good that buyers are willing and able to purchase. Law of demand: the claim that the quanhty demanded of a good falls when the price of the good rises, other things equal
5 The Demand Schedule Demand schedule: a table that shows the relahonship between the price of a good and the quanhty demanded Example: Helen s demand for laves. NoHce that Helen s preferences obey the law of demand. Price of lattes Quantity of lattes demanded $
6 Helen s Demand Schedule & Curve Price of La;es Quan*ty of La;es Price of lattes Quantity of lattes demanded $
7 Market Demand versus Individual Demand The quanhty demanded in the market is the sum of the quanhhes demanded by all buyers at each price. Suppose Helen and Ken are the only two buyers in the LaVe market. (Q d = quanhty demanded) Price $ Helen s Q d Ken s Q d Market Q d = 24 = 21 = 18 = 15 = 12 = 9 = 6
8 The Market Demand Curve for LaVes P Q P Q d (Market) $
9 Demand Curve ShiZers The demand curve shows how price affects quanhty demanded, other things being equal. These other things are non- price determinants of demand (i.e., things that determine buyers demand for a good, other than the good s price). Changes in them shiz the D curve
10 Demand Curve ShiZers: # of Buyers Increase in # of buyers increases quanhty demanded at each price, shizs D curve to the right.
11 Demand Curve ShiZers: # of Buyers P Suppose the number of buyers increases. Then, at each P, Q d will increase (by 5 in this example). Q
12 Demand Curve ShiZers: Income Demand for a normal good is posihvely related to income. Increase in income causes increase in quanhty demanded at each price, shizs D curve to the right. (Demand for an inferior good is negahvely related to income. An increase in income shizs D curves for inferior goods to the lez.)
13 Demand Curve ShiZers: Two goods are subs*tutes if an increase in the price of one causes an increase in demand for the other. Example: pizza and hamburgers. An increase in the price of pizza increases demand for hamburgers, shizing hamburger demand curve to the right. Other examples: Coke and Pepsi, laptops and desktop computers, CDs and music downloads Prices of Related Goods
14 Demand Curve ShiZers: Two goods are complements if an increase in the price of one causes a fall in demand for the other. Example: computers and sozware. If price of computers rises, people buy fewer computers, and therefore less sozware. SoZware demand curve shizs lez. Prices of Related Goods Other examples: college tuihon and textbooks, bagels and cream cheese, eggs and bacon
15 Demand Curve ShiZers: Tastes Anything that causes a shiz in tastes toward a good will increase demand for that good and shiz its D curve to the right. Example: The Atkins diet became popular in the 90s, caused an increase in demand for eggs, shized the egg demand curve to the right.
16 Demand Curve ShiZers: Expecta*ons ExpectaHons affect consumers buying decisions. Examples: If people expect their incomes to rise, their demand for meals at expensive restaurants may increase now. If the economy sours and people worry about their future job security, demand for new autos may fall now.
17 Summary: Variables That Influence Buyers Variable A change in this variable Price causes a movement along the D curve # of buyers shifts the D curve Income shifts the D curve Price of related goods shifts the D curve Tastes shifts the D curve Expectations shifts the D curve
18 ACTIVE LEARNING 1 Demand curve Draw a demand curve for music downloads. What happens to it in each of the following scenarios? Why? A. The price of ipods falls B. The price of music downloads falls C. The price of CDs falls Enyezdi/ShuVerstock.com 2015 Cengage Learning. All Rights Reserved. May not be copied, scanned, or duplicated, in whole or in part, except for use as permitted in a license distributed with a certain product or service or otherwise on a password-protected website for classroom use.
19 Supply The quan*ty supplied of any good is the amount that sellers are willing and able to sell. Law of supply: the claim that the quanhty supplied of a good rises when the price of the good rises, other things equal
20 The Supply Schedule Supply schedule: A table that shows the relahonship between the price of a good and the quanhty supplied. Example: Starbucks supply of laves.! Notice that Starbucks supply schedule obeys the law of supply. Price of lattes Quantity of lattes supplied $
21 Starbucks Supply Schedule & Curve P Q Price of lattes Quantity of lattes supplied $
22 Market Supply versus Individual Supply The quanhty supplied in the market is the sum of the quanhhes supplied by all sellers at each price. Suppose Starbucks and Peet s are the only two sellers in this market. (Q s = quanhty supplied) Price $ Starbucks Peet s Market Q s = 0 = 5 = 10 = 15 = 20 = 25 = 30
23 P The Market Supply Curve P Q S (Market) $ Q
24 Supply Curve ShiZers The supply curve shows how price affects quanhty supplied, other things being equal. These other things are non- price determinants of supply. Changes in them shiz the S curve
25 Supply Curve ShiZers: Input Prices Examples of input prices: wages, prices of raw materials. A fall in input prices makes produchon more profitable at each output price, so firms supply a larger quanhty at each price, and the S curve shizs to the right.
26 P Supply Curve ShiZers: Input Prices Suppose the price of milk falls. At each price, the quantity of lattes supplied will increase (by 5 in this example). Q
27 Supply Curve ShiZers: Technology Technology determines how much inputs are required to produce a unit of output. A cost- saving technological improvement has the same effect as a fall in input prices, shizs S curve to the right.
28 Supply Curve ShiZers: # of Sellers An increase in the number of sellers increases the quanhty supplied at each price, shizs S curve to the right.
29 Supply Curve ShiZers: Expecta*ons Example: Events in the Middle East lead to expectahons of higher oil prices. In response, owners of Texas oilfields reduce supply now, save some inventory to sell later at the higher price. S curve shizs lez. In general, sellers may adjust supply* when their expectahons of future prices change. (*If good not perishable)
30 Summary: Variables that Influence Sellers Variable A change in this variable Price causes a movement along the S curve Input Prices shifts the S curve Technology shifts the S curve # of Sellers shifts the S curve Expectations shifts the S curve
31 ACTIVE LEARNING 2 Supply curve Draw a supply curve for tax return preparation software. What happens to it in each of the following scenarios? A. Retailers cut the price of the software. B. A technological advance allows the software to be produced at lower cost. C. Professional tax return preparers raise the price of the services they provide Cengage Learning. All Rights Reserved. May not be copied, scanned, or duplicated, in whole or in part, except for use as permitted in a license distributed with a certain product or service or otherwise on a password-protected website for classroom use. v777999/shuverstock.com
32 Supply and Demand Together P D S Equilibrium: P has reached the level where quantity supplied equals quantity demanded Q
33 Equilibrium price: P the price that equates quantity supplied with quantity demanded D S Q P Q D Q S $
34 Equilibrium quanhty: P the quantity supplied and demanded at the equilibrium price D S Q P Q D Q S $
35 Surplus (a.k.a. excess supply): when quantity supplied is greater than quantity demanded P D Surplus S Example: If P = $5, then Q D = 9 lattes and Q S = 25 lattes resulting in a surplus of 16 lattes Q
36 Surplus (a.k.a. excess supply): when quantity supplied is greater than quantity demanded P D Surplus S Facing a surplus, sellers try to increase sales by cutting price. This causes Q D to rise and Q S to fall which reduces the surplus. Q
37 Surplus (a.k.a. excess supply): when quantity supplied is greater than quantity demanded P D Surplus S Facing a surplus, sellers try to increase sales by cutting price. This causes Q D to rise and Q S to fall. Prices continue to fall until market reaches equilibrium. Q
38 Shortage (a.k.a. excess demand): when quantity demanded is greater than quantity supplied P D S Example: If P = $1, then Q D = 21 lattes and Q S = 5 lattes resulting in a shortage of 16 lattes Shortage Q
39 Shortage (a.k.a. excess demand): when quantity demanded is greater than quantity supplied P D S Facing a shortage, sellers raise the price, causing Q D to fall and Q S to rise, which reduces the shortage. Shortage Q
40 Shortage (a.k.a. excess demand): when quantity demanded is greater than quantity supplied P D Shortage S Facing a shortage, sellers raise the price, causing Q D to fall and Q S to rise. Prices continue to rise until market reaches equilibrium. Q
41 Three Steps to Analyzing Changes in Eq m To determine the effects of any event, 1. Decide whether the event shizs S curve, D curve, or both. 2. Decide in which direchon curve shizs. 3. Use supply demand diagram to see how the shiz changes eq m P and Q.
42 EXAMPLE: The Market for Hybrid Cars price of hybrid cars P S 1 P 1 Q 1 D 1 Q quantity of hybrid cars
43 EXAMPLE 1: A ShiZ in Demand EVENT TO BE ANALYZED: Increase in price of gas. P S 1 STEP 1: D curve shifts because STEP 2: price of gas affects demand for D shifts right hybrids. because S STEP curve 3: high gas price makes does hybrids not shift, The shift because causes price an more attractive of increase relative gas does in price to other not cars. affect and quantity cost of of producing hybrid cars. hybrids. P 2 P 1 Q 1 Q 2 D 1 D 2 Q
44 EXAMPLE 1: A ShiZ in Demand Notice: When P rises, producers supply a larger quantity of hybrids, even though the S curve has not shifted. P 2 P 1 P S 1 Always be careful to distinguish b/w a shift in a curve and a movement along the curve. Q 1 Q 2 D 1 D 2 Q
45 Terms for ShiZ vs. Movement Along Curve Change in supply: a shiz in the S curve occurs when a non- price determinant of supply changes (like technology or costs) Change in the quan*ty supplied: a movement along a fixed S curve occurs when P changes Change in demand: a shiz in the D curve occurs when a non- price determinant of demand changes (like income or # of buyers) Change in the quan*ty demanded: a movement along a fixed D curve occurs when P changes
46 EXAMPLE 2: A ShiZ in Supply EVENT: New technology reduces cost of producing hybrid cars. P S 1 S 2 STEP 1: S curve shifts because STEP 2: event affects cost of production. S shifts right D because curve does not shift, STEP because 3: event reduces cost, production The shift causes makes production technology is price not to more profitable one fall of the at factors and quantity any given that price. affect to rise. demand. P 1 P 2 Q 1 Q 2 D 1 Q
47 EXAMPLE 3: A ShiZ in Both Supply and Demand EVENTS: Price of gas rises AND new technology reduces produchon costs P S 1 S 2 STEP 1: Both curves shift. STEP 2: Both shift to the right. P 2 P 1 STEP 3: Q rises, but effect on P is ambiguous: If demand increases more than supply, P rises. Q 1 Q 2 D 1 D 2 Q
48 EXAMPLE 3: A ShiZ in Both Supply and Demand EVENTS: price of gas rises AND new technology reduces production costs P S 1 S 2 STEP 3, cont. But if supply increases more than demand, P falls. P 1 P 2 Q 1 D 1 Q 2 D 2 Q
49 ACTIVE LEARNING 3 ShiZs in supply and demand Use the three-step method to analyze the effects of each event on the equilibrium price and quantity of music downloads. Event A: A fall in the price of CDs Event B: Sellers of music downloads negotiate a reduction in the royalties they must pay for each song they sell. Event C: Events A and B both occur Cengage Learning. All Rights Reserved. May not be copied, scanned, or duplicated, in whole or in part, except for use as permitted in a license distributed with a certain product or service or otherwise on a password-protected website for classroom use.
50 CONCLUSION: How Prices Allocate Resources One of the Ten Principles from Chapter 1: Markets are usually a good way to organize economic ac9vity. In market economies, prices adjust to balance supply and demand. These equilibrium prices are the signals that guide economic decisions and thereby allocate scarce resources.
51 Summary A compehhve market has many buyers and sellers, each of whom has livle or no influence on the market price. Economists use the supply and demand model to analyze compehhve markets. The downward- sloping demand curve reflects the law of demand, which states that the quanhty buyers demand of a good depends negahvely on the good s price Cengage Learning. All Rights Reserved. May not be copied, scanned, or duplicated, in whole or in part, except for use as permitted in a license distributed with a certain product or service or otherwise on a password-protected website for classroom use.
52 Summary Besides price, demand depends on buyers incomes, tastes, expectahons, the prices of subshtutes and complements, and number of buyers. If one of these factors changes, the D curve shizs. The upward- sloping supply curve reflects the Law of Supply, which states that the quanhty sellers supply depends posihvely on the good s price. Other determinants of supply include input prices, technology, expectahons, and the # of sellers. Changes in these factors shiz the S curve Cengage Learning. All Rights Reserved. May not be copied, scanned, or duplicated, in whole or in part, except for use as permitted in a license distributed with a certain product or service or otherwise on a password-protected website for classroom use.
53 Summary The intersechon of S and D curves determines the market equilibrium. At the equilibrium price, quanhty supplied equals quanhty demanded. If the market price is above equilibrium, a surplus results, which causes the price to fall. If the market price is below equilibrium, a shortage results, causing the price to rise Cengage Learning. All Rights Reserved. May not be copied, scanned, or duplicated, in whole or in part, except for use as permitted in a license distributed with a certain product or service or otherwise on a password-protected website for classroom use.
54 Summary We can use the supply- demand diagram to analyze the effects of any event on a market: First, determine whether the event shizs one or both curves. Second, determine the direchon of the shizs. Third, compare the new equilibrium to the inihal one. In market economies, prices are the signals that guide economic decisions and allocate scarce resources Cengage Learning. All Rights Reserved. May not be copied, scanned, or duplicated, in whole or in part, except for use as permitted in a license distributed with a certain product or service or otherwise on a password-protected website for classroom use.
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