Macroeonomics. 4 this chapter, The Market Forces of Supply and Demand. look for the answers to these questions: Demand. Markets and Competition
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1 C H A T E R In 4 this chapter, look for the answers to these questions: The Market Forces of upply and emand R I N C I L E O F Macroeonomics N. Gregory Mankiw remium oweroint lides by Ron Cronovich 2009 outh-western, a part of Cengage Learning, all rights reserved 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 quantity sold? How do changes in the factors that affect demand or supply affect the market price and quantity of a good? How do markets allocate resources? 1 Markets and Competition A market is a group of buyers and sellers of a particular product. A competitive market is one with many buyers and sellers, each has a negligible effect on price. In a perfectly competitive 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 competitive. THE MARKET FORCE OF ULY AN EMAN 2 emand The quantity 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 quantity demanded of a good falls when the price of the good rises, other things equal THE MARKET FORCE OF ULY AN EMAN 3 1
2 The emand chedule Helen s emand chedule & Curve emand schedule: a table that shows the relationship between the price of a good and the quantity demanded rice of lattes uantity of lattes demanded rice of Lattes rice of lattes uantity of lattes demanded Example: Helen s demand for lattes. Notice that Helen s preferences obey the Law of emand uantity of Lattes THE MARKET FORCE OF ULY AN EMAN 4 THE MARKET FORCE OF ULY AN EMAN 5 Market emand versus Individual emand The quantity demanded in the market is the sum of the quantities demanded by all buyers at each price. uppose Helen and Ken are the only two buyers in the Latte market. ( d quantity demanded) rice Helen s d Ken s d Market d The Market emand Curve for Lattes THE MARKET FORCE OF ULY AN EMAN 7 d (Market)
3 emand Curve hifters The demand curve shows how price affects quantity 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 shift the curve emand Curve hifters: # of Buyers Increase in # of buyers increases quantity demanded at each price, shifts curve to the right. THE MARKET FORCE OF ULY AN EMAN 8 THE MARKET FORCE OF ULY AN EMAN 9 emand Curve hifters: # of Buyers uppose the number of buyers increases. Then, at each, d will increase (by 5 in this example). THE MARKET FORCE OF ULY AN EMAN 10 emand Curve hifters: Income emand for a normal good is positively related to income. Increase in income causes increase in quantity demanded at each price, shifts curve to the right. (emand for an inferior good is negatively related to income. An increase in income shifts curves for inferior goods to the left.) THE MARKET FORCE OF ULY AN EMAN 11 3
4 emand Curve hifters: rices of Related Goods Two goods are substitutes 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, shifting hamburger demand curve to the right. Other examples: Coke and epsi, laptops and desktop computers, Cs and music downloads THE MARKET FORCE OF ULY AN EMAN 12 emand Curve hifters: rices of Related Goods Two goods are complements if an increase in the price of one causes a fall in demand for the other. Example: computers and software. If price of computers rises, people buy fewer computers, and therefore less software. oftware demand curve shifts left. Other examples: college tuition and textbooks, bagels and cream cheese, eggs and bacon THE MARKET FORCE OF ULY AN EMAN 13 emand Curve hifters: Tastes Anything that causes a shift in tastes toward a good will increase demand for that good and shift its curve to the right. Example: The Atkins diet became popular in the 90s, caused an increase in demand for eggs, shifted the egg demand curve to the right. emand Curve hifters: Expectations Expectations 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. THE MARKET FORCE OF ULY AN EMAN 14 THE MARKET FORCE OF ULY AN EMAN 15 4
5 ummary: Variables That Influence Buyers Variable rice A change in this variable causes a movement along the curve # of buyers shifts the curve Income rice of related goods Tastes Expectations shifts the curve shifts the curve shifts the curve shifts the curve A C T I V E L E A R N I N G 1 emand Curve raw a demand curve for music downloads. What happens to it in each of the following scenarios? Why? A. The price of iods falls B. The price of music downloads falls C. The price of Cs falls THE MARKET FORCE OF ULY AN EMAN upply The quantity supplied of any good is the amount that sellers are willing and able to sell. Law of supply: the claim that the quantity supplied of a good rises when the price of the good rises, other things equal THE MARKET FORCE OF ULY AN EMAN 18 The upply chedule upply schedule: A table that shows the relationship between the price of a good and the quantity supplied. Example: tarbucks supply of lattes. Notice that tarbucks supply schedule obeys the Law of upply. rice of lattes uantity of lattes supplied THE MARKET FORCE OF ULY AN EMAN 19 5
6 tarbucks upply chedule & Curve rice of lattes uantity of lattes supplied THE MARKET FORCE OF ULY AN EMAN 20 Market upply versus Individual upply The quantity supplied in the market is the sum of the quantities supplied by all sellers at each price. uppose tarbucks and Jitters are the only two sellers in this market. ( s quantity supplied) rice tarbucks Jitters Market s The Market upply Curve (Market) upply Curve hifters The supply curve shows how price affects quantity supplied, other things being equal. These other things are non-price determinants of supply. Changes in them shift the curve THE MARKET FORCE OF ULY AN EMAN 22 THE MARKET FORCE OF ULY AN EMAN 23 6
7 upply Curve hifters: Input rices Examples of input prices: wages, prices of raw materials. A fall in input prices makes production more profitable at each output price, so firms supply a larger quantity at each price, and the curve shifts to the right. THE MARKET FORCE OF ULY AN EMAN 24 upply Curve hifters: Input rices uppose the price of milk falls. At each price, the quantity of Lattes supplied will increase (by 5 in this example). THE MARKET FORCE OF ULY AN EMAN 25 upply Curve hifters: 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, shifts curve to the right. upply Curve hifters: # of ellers An increase in the number of sellers increases the quantity supplied at each price, shifts curve to the right. THE MARKET FORCE OF ULY AN EMAN 26 THE MARKET FORCE OF ULY AN EMAN 27 7
8 upply Curve hifters: Expectations Example: Events in the Middle East lead to expectations of higher oil prices. In response, owners of Texas oilfields reduce supply now, save some inventory to sell later at the higher price. curve shifts left. In general, sellers may adjust supply * when their expectations of future prices change. ( * If good not perishable) THE MARKET FORCE OF ULY AN EMAN 28 ummary: Variables that Influence ellers Variable rice Input rices Technology A change in this variable causes a movement along the curve shifts the curve shifts the curve # of ellers shifts the curve Expectations shifts the curve THE MARKET FORCE OF ULY AN EMAN 29 A C T I V E L E A R N I N G 2 upply Curve raw 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. rofessional tax return preparers raise the price of the services they provide. 30 upply and emand Together Equilibrium: has reached the level where quantity supplied equals quantity demanded THE MARKET FORCE OF ULY AN EMAN 31 8
9 Equilibrium price: the price that equates quantity supplied with quantity demanded THE MARKET FORCE OF ULY AN EMAN 32 $ Equilibrium quantity: the quantity supplied and quantity demanded at the equilibrium price THE MARKET FORCE OF ULY AN EMAN 33 $ urplus (a.k.a. excess supply): when quantity supplied is greater than quantity demanded urplus Example: If $5, then THE MARKET FORCE OF ULY AN EMAN 34 and 9 lattes 25 lattes resulting in a surplus of 16 lattes urplus (a.k.a. excess supply): when quantity supplied is greater than quantity demanded urplus Facing a surplus, sellers try to increase sales by cutting price. This causes to rise and to fall which reduces the surplus. THE MARKET FORCE OF ULY AN EMAN 35 9
10 urplus (a.k.a. excess supply): when quantity supplied is greater than quantity demanded urplus Facing a surplus, sellers try to increase sales by cutting price. This causes to rise and to fall. rices continue to fall until market reaches equilibrium. THE MARKET FORCE OF ULY AN EMAN 36 hortage (a.k.a. excess demand): when quantity demanded is greater than quantity supplied hortage Example: If $1, then 21 lattes and 5 lattes resulting in a shortage of 16 lattes THE MARKET FORCE OF ULY AN EMAN 37 hortage (a.k.a. excess demand): when quantity demanded is greater than quantity supplied hortage Facing a shortage, sellers raise the price, causing to fall and to rise, which reduces the shortage. THE MARKET FORCE OF ULY AN EMAN 38 hortage (a.k.a. excess demand): when quantity demanded is greater than quantity supplied hortage Facing a shortage, sellers raise the price, causing to fall and to rise. rices continue to rise until market reaches equilibrium. THE MARKET FORCE OF ULY AN EMAN 39 10
11 Three teps to Analyzing Changes in Eq m EXAMLE: The Market for Hybrid Cars To To determine the effects of of any event, ecide whether event shifts curve, curve, or or both ecide in in which direction curve shifts. price of hybrid cars Use supply-demand diagram to to see how the shift changes eq m and THE MARKET FORCE OF ULY AN EMAN 40 quantity of hybrid cars THE MARKET FORCE OF ULY AN EMAN 41 EXAMLE 1: EVENT TO BE ANALYZE: Increase in price of gas. TE 1: curve shifts because TE 2: price of gas affects demand for shifts right hybrids. because TE 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. A hift in emand 2 1 THE MARKET FORCE OF ULY AN EMAN EXAMLE 1: Notice: When rises, producers supply a larger quantity of hybrids, even though the curve has not shifted. Always be careful to distinguish b/w a shift in a curve and a movement along the curve. A hift in emand 2 1 THE MARKET FORCE OF ULY AN EMAN
12 Terms for hift vs. Movement Along Curve Change in supply: a shift in the curve occurs when a non-price determinant of supply changes (like technology or costs) Change in the quantity supplied: a movement along a fixed curve occurs when changes Change in demand: a shift in the curve occurs when a non-price determinant of demand changes (like income or # of buyers) Change in the quantity demanded: a movement along a fixed curve occurs when changes EXAMLE 2: EVENT: New technology reduces cost of producing hybrid cars. TE 1: curve shifts because TE 2: event affects cost of production. shifts right because curve does not shift, TE 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. A hift in upply 44 THE MARKET FORCE OF ULY AN EMAN EXAMLE 3: EVENT: price of gas rises AN new technology reduces production costs TE 1: Both curves shift. TE 2: Both shift to the right. A hift in Both upply and emand 2 1 TE 3: rises, but effect on is ambiguous: If demand increases more than supply, rises. THE MARKET FORCE OF ULY AN EMAN EXAMLE 3: EVENT: price of gas rises AN new technology reduces production costs TE 3, cont. But if supply increases more than demand, falls. A hift in Both upply and emand 1 2 THE MARKET FORCE OF ULY AN EMAN
13 A C T I V E L E A R N I N G 3 hifts 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 Cs Event B: ellers of music downloads negotiate a reduction in the royalties they must pay for each song they sell. CONCLUION: How rices Allocate Resources One of the Ten rinciples from Chapter 1: Markets are usually a good way to organize economic activity. 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. Event C: Events A and B both occur. 48 THE MARKET FORCE OF ULY AN EMAN 49 CHATER UMMARY CHATER UMMARY A competitive market has many buyers and sellers, each of whom has little or no influence on the market price. Economists use the supply and demand model to analyze competitive markets. The downward-sloping demand curve reflects the Law of emand, which states that the quantity buyers demand of a good depends negatively on the good s price. 50 Besides price, demand depends on buyers incomes, tastes, expectations, the prices of substitutes and complements, and number of buyers. If one of these factors changes, the curve shifts. The upward-sloping supply curve reflects the Law of upply, which states that the quantity sellers supply depends positively on the good s price. Other determinants of supply include input prices, technology, expectations, and the # of sellers. Changes in these factors shift the curve
14 CHATER UMMARY CHATER UMMARY The intersection of and curves determines the market equilibrium. At the equilibrium price, quantity supplied equals quantity 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. We can use the supply-demand diagram to analyze the effects of any event on a market: First, determine whether the event shifts one or both curves. econd, determine the direction of the shifts. Third, compare the new equilibrium to the initial one. In market economies, prices are the signals that guide economic decisions and allocate scarce resources
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