Supply and Demand Essay Example

Supply and Demand Essay chapter: 3 Supply and Demand Krugman/Wells Economics  ©2009 ? Worth Publishers WHAT YOU WILL LEARN IN THIS CHAPTER ? ? ? ? ? What a competitive market is and how it is described by the supply and demand model What the demand curve and supply curve are The difference between movements along a curve and shifts of a curve How the supply and demand curves determine a market’s equilibrium price and equilibrium quantity In the case of a shortage or surplus, how price moves the market back to equilibrium 2 of 42 Supply and Demand ? A competitive market: ? ? Many buyers and sellers Same good or service ? ? The supply and demand model is a model of how a competitive market works. Five key elements: ? ? ? ? ? Demand curve Supply curve Demand and supply curve shifts Market equilibrium Changes in the market equilibrium 3 of 42 Demand Schedule ? A demand schedule shows how much of a good or service consumers will want to buy at different prices. Demand Schedule for Coffee Beans Price of coffee beans (per pound) Quantity of coffee beans demanded (billions of pounds) $2. 00 1. 75 7. 1 7. 5 1. 50 1. 25 1. 00 0. 75 0. 50 8. 1 8. 9 10. 0 11. 5 14. 2 of 42 Demand Curve Price of coffee bean (per gallon) $2. 00 1. 75 1. 50 1. 25 1. 00 0. 75 0. 50 A demand curve is the graphical representation of the demand schedule; it shows how much of a good or service consumers want to buy at any given price. As price rises, the quantity demanded falls Demand curve, D 0 7 9 11 13 15 17 Quantity of coffee beans (billions of pounds) 5 of 42 GLOBAL COMPARISON Pay Mor e, Pump Less†¦ ? Price of gasoline (per gallon) Germany Because of high taxes, gasoline and diesel fuel are more than twice as expensive in most European countries as in the United States. We will write a custom essay sample on Supply and Demand specifically for you for only $16.38 $13.9/page Order now We will write a custom essay sample on Supply and Demand specifically for you FOR ONLY $16.38 $13.9/page Hire Writer We will write a custom essay sample on Supply and Demand specifically for you FOR ONLY $16.38 $13.9/page Hire Writer According to the law of demand, Europeans should buy less gasoline than Americans, and they do: Europeans consume less than half as much fuel as Americans, mainly because they drive smaller cars with better mileage. $8 7 6 United Kingdom Italy France Spain ? 5 4 3 Japan Canada United States 0. 2 0. 6 1. 0 1. 4 0 Consumption of gasoline (gallons per day per capita) 6 of 42 An Increase in Demand ? ? An increase in the population and other factors generate an increase in demand – a rise in the quantity demanded at any given price. This is represented by the two demand schedules one showing demand in 2002, before the rise in population, the other showing demand in 2006, after the rise in population. Demand Schedules for Coffee Beans Quantity of coffee beans demanded (billions of pounds) Price of coffee beans (per pound) in 2002 in 2006 $2. 00 1. 75 1. 50 1. 25 1. 00 0. 75 0. 50 7. 1 7. 5 8. 1 8. 9 10. 0 11. 5 14. 2 8. 5 9. 0 9. 7 10. 7 12. 0 13. 8 17. 0 7 of 42 An Increase in Demand Price of coffee beans (per gallon) $2. 00 Increase in population ? more coffee drinkers 1. 75 1. 50 1. 25 1. 00 0. 75 0. 50 0 Demand curve in 2006 Demand curve in 2002 7 9 11 13 D 1 D 17 2 15 Quantity of coffee beans (billions of pounds) A shift of the demand curve is a change in the quantity demanded at any given price, represented by the change of the original demand curve to a new position, denoted by a new demand curve. 8 of 42 Movement Along the Demand Curve Price of coffee beans (per gallon) $2. 00 1. 75 1. 50 1. 25 A C †¦ is not the same thing as a movement along the demand curve B A shift of the demand curve†¦ A movement along the demand curve is a change in the quantity demanded of a good that is the result of a change in that good’s price. 1. 00 0. 75 . 50 D 7 8. 1 9. 7 10 13 1 D 17 2 0 15 Quantity of coffee beans (billions of pounds) 9 of 42 Shifts of the Demand Curve Price Increase in demand An â€Å"increase in demand† A â€Å"decrease in demand†, means a leftward shift of rightward shift of the demand curve: at any given price, consumers demand a smaller quantity larger quantity than before. (D1? D3) (D1? D2) Decrease in demand D 3 D 1 D 2 Quantity 10 of 42 What Causes a Demand Curve to Shift? ? Changes in the Prices of Related Goods ? Substitutes: Two goods are substitutes if a fall in the price of one of the goods makes consumers less willing to buy the other good. Complements: Two goods are complements if a fall in the price of one good makes people more willing to buy the other good. ? 11 of 42 What Causes a Demand Curve to Shift? ? Changes in Income ? ? Normal Goods: When a rise in income increases the demand for a good the normal case we say that the good is a normal good. Inferior Goods: When a rise in income decreases the demand for a good, it is an inferior good. ? ? Changes in Tastes Changes in Expectations 12 of 42 Individual Demand Curve and the Market Demand Curve The market demand curve is the horizontal sum of the individual demand curves of all consumers in that market. (a) (b) (c) Darla’s Individual Demand Curve Price of coffee beans (per pound) Price of coffee beans (per pound) Dino’s Individual Demand Curve Price of coffee beans (per pound) Market Demand Curve $2 $2 $2 DMarket 1 1 1 DDarla DDino 0 20 30 Quantity of coffee beans (pounds) 0 10 20 Quantity of coffee beans (pounds) 0 30 40 50 Quantity of coffee beans (pounds) 13 of 42 Supply Schedule ? A supply schedule shows how much of a good or service would be supplied at different prices. Supply Schedule for Coffee Beans Price of coffee beans (per pound) Quantity of coffee beans supplied (billions of pounds) $2. 00 1. 75 1. 50 1. 25 1. 00 0. 75 0. 50 11. 6 11. 5 11. 2 10. 7 10. 0 9. 1 8. 0 14 of 42 Supply Curve Price of coffee beans (per pound) Supply curve, S $2. 00 1. 75 1. 50 1. 25 1. 00 0. 75 0. 50 0 7 9 11 13 A supply curve shows graphically how much of a good or service people are willing to sell at any given price. As price rises, the quantity supplied rises. 15 17 Quantity of coffee beans (billions of pounds) 15 of 42 An Increase in Supply ? ? The entry of Vietnam Supply Schedule for Coffee Beans into the coffee bean Quantity of beans supplied Price of business generated coffee beans (billions of pounds) an increase in (per pound) Before entry After entry supply—a rise in the quantity supplied at $2. 00 11. 6 13. 9 any given price. 1. 75 11. 5 13. 8 This event is 1. 50 11. 2 13. 4 represented by the 1. 25 10. 7 12. 8 two supply schedules—one 1. 00 10. 0 12. 0 showing supply before 0. 75 9. 1 10. 9 Vietnam’s entry, the 0. 50 8. 0 9. 6 other showing supply after Vietnam came in. 16 of 42 An Increase in Supply Price of coffee beans (per pound) S $2. 0 1 S 2 Vietnam enters coffee bean business ? more coffee producers 1. 75 1. 50 1. 25 1. 00 0. 75 0. 50 0 7 A movement along the supply curve†¦ †¦ is not the same thing as a shift of the supply curve 9 11 13 15 17 Quantity of coffee beans (billions of pounds) A shift of the supply curve is a change in the quantity supplied of a good at any given pric e. 17 of 42 Movement Along the Supply Curve Price of coffee beans (per pound) $2. 00 1. 75 1. 50 1. 25 1. 00 0. 75 0. 50 0 7 10 11. 2 12 A C †¦ is not the same thing as a shift of the supply curve 15 17 A movement along the supply curve†¦ S 1 S 2 B Quantity of coffee beans (billions of pounds) A movement along the supply curve is a change in the quantity supplied of a good that is the result of a change in that good’s price. 18 of 42 Shifts of the Supply Curve Price S 3 S 1 S 2 Increase in supply Any â€Å"increase in â€Å"decrease in supply† means a leftward shift of the rightward shift of the supply curve: at any given price, there is an a decrease in the increase in the quantity supplied. (S1? S2) S3) Decrease in supply Quantity 19 of 42 What Causes a Supply Curve to Shift? ? ? ? ? ? Changes in input prices ? An input is a good that is used to produce another good. Changes in the prices of related goods and services Changes in technology Changes in expectations Changes in the number of producers 20 of 42 Individual Supply Curve and the Market Supply Curve The market supply curve is the horizontal sum of the individual supply curves of all firms in that market. (a) Price of coffee beans (per pound) (b) Price of coffee beans (per pound) (c) Market Supply Curve Price of coffee beans (per pound) Mr. Figueroa’s Individual Supply Curve SFigueroa Mr. Bien Pho’s Individual Supply Curve S Pho Bien $2 $2 $2 S Market 1 1 1 0 1 2 3 0 1 2 Quantity of coffee beans (pounds) 0 1 2 3 4 5 Quantity of coffee beans (pounds) Quantity of coffee beans (pounds) 21 of 42 Supply, Demand and Equilibrium ? Equilibrium in a competitive market: when the quantity demanded of a good equals the quantity supplied of that good. The price at which this takes place is the equilibrium price (a. k. a. market-clearing price): ? ? Every buyer finds a seller and vice versa. The quantity of the good bought and sold at that price is the equilibrium quantity. ? 22 of 42 Market Equilibrium Price of coffee beans (per pound) Supply 2. 00 1. 75 1. 50 1. 25 Market equilibrium occurs at point E, where the supply curve and the demand curve intersect. Equilibrium price 1. 00 0. 75 E Equilibrium 0. 50 0 7 10 Equilibrium quantity 13 Demand 15 17 Quantity of coffee beans (billions of pounds) 23 of 42 Surplus Price of coffee beans (per pound) Supply $2. 00 1. 75 Surplus 1. 50 1. 25 1. 00 0. 75 E There is a surplus of a good when the quantity supplied exceeds the quantity demanded. Surpluses occur when the price is above its equilibrium level. 0. 50 0 7 8. 1 10 11. 2 13 Demand 15 17 Quantity of coffee beans (billions of pounds) Quantity demanded Quantity supplied 24 of 42 Shortage Price of coffee beans (per pound) $2. 00 1. 75 Supply 1. 50 1. 25 There is a shortage of a good when the quantity demanded exceeds the quantity supplied. Shortages occur when the price is below its equilibrium level. 1. 00 0. 75 E 0. 50 0 7 9. 1 Shortage Demand 13 15 17 Quantity of coffee beans (billions of pounds) 10 11. 5 Quantity supplied Quantity demanded 25 of 42 >ECONOMICS IN ACTION The Price of Admission: †¢ Compare the box office price for a recent Justin Timberlake concert in Miami, Florida, to the StubHub. com price for seats in the same location: $88. 0 versus $155. †¢ Why is there such a big difference in prices? For major events, buying tickets from the box office means waiting in very long lines. Ticket buyers who use Internet resellers have decided that the opportunity cost of their time is too high to spend waiting in line. For those major events with online box offices selling tickets at face value, tick ets often sell out within minutes. †¢ In this case, some people who want to go to the concert badly but have missed out on the opportunity to buy cheaper tickets from the online box office are willing to pay the higher Internet reseller price. 6 of 42 Equilibrium and Shifts of the Demand Curve Price of coffee beans An increase in demand†¦ Supply E P 2 2 Price rises E P 1 1 †¦ leads to a movement along the supply curve due to a higher equilibrium price and higher equilibrium quantity D 2 D 1 Q 1 Q 2 Quantity of coffee beans Quantity rises 27 of 42 Equilibrium and Shifts of the Supply Curve Price of coffee beans S 2 S 1 A decrease in supply†¦ P Price rises E 2 2 †¦ leads to a movement along the demand curve due to a higher equilibrium price and lower equilibrium quantity P 1 E1 Demand Q 2 Q 1 Quantity of coffee beans Quantity falls 28 of 42 Technology Shifts of the Supply Curve Price An increase in supply †¦ S1 S2 †¦ leads to a movement along the demand curve to a lower equilibrium price and higher equilibrium quantity. E1 Price falls P1 P2 E2 Technological innovation: In the early 1970s, engineers learned how to put microscopic electronic components onto a silicon chip; progress in the technique has allowed ever more components to be put on each chip. Demand Q 1 Q 2 Quantity Quantity increases 29 of 42 Simultaneous Shifts of Supply and Demand (a) One possible outcome: Price Rises, Quantity Rises Price of coffee Small decrease in supply S 2 S 1 E P 2 2 The opposing forces Two increase in demand dominates the determining the decrease in supply. equilibrium quantity. E P 1 1 D D 1 Large increase in demand Q 1 Q2 2 Quantity of coffee 30 of 42 Simultaneous Shifts of Supply and Demand (b) Another Possibility Outcome: Price Rises, Quantity Falls Price of coffee Large decrease in supply S 2 S 1 E P 2 2 Two opposing forces determining the equilibrium quantity. E P 1 1 Small increase in demand D D 2 1 Q 2 Q 1 Quantity of coffee 31 of 42 Simultaneous Shifts of Supply and Demand We can make the following predictions about the outcome when the supply and demand curves shift simultaneously: Simultaneous Shifts of Supply and Demand Demand Increases Demand Decreases Supply Increases Supply Decreases Price: ambiguous Quantity: up Price: up Quantity: ambiguous Price: down Price: ambiguous Quantity: ambiguous Quantity: down 32 of 42 FOR INQUIRING MINDS Your Turn on the Runway: An Exercise of Supply, Demand and Supermodels ? The ease of transmitting photos over the Internet and the relatively low cost of international travel ? beautiful young women from all over the world, eagerly trying to make it as models = influx of aspiring models from around the world In addition the tastes of many of those who hire models have changed ? hey prefer celebrities What happened to the equilibrium price of a young (not a celebrity) fashion model? Use your supply and demand curves to determine the salaries of â€Å"America’s Next Best Models†Ã¢â‚¬ ¦ 33 of 42 ? ? FOR INQUIRING MINDS Another Example: Supply, Demand and Controlled Substances Price S2 S1 E2 P2 Price rises P1 E1 Howe ver, we can see The equilibrium by comparing the price has risen from original equilibrium E1 P1 to P2, and this with â€Å"war on The the new drugs† induces suppliers to equilibrium E2 that the provide drugs shifts the supply actual reduction in the despite the left. curve tothe risks. uantity of drugs supplied is much smaller than the shift of the supply curve. Demand Q2 Q1 Quantity Quantity falls 34 of 42 >ECONOMICS IN ACTION The Great Tortilla Crises: †¢ A sharp rise in the price of tortillas, a staple food of Mexico’s poor, which had gone from 25 cents a pound to between 35 and 45 cents a pound in just a few months in early 2007. Why were tortilla prices soaring? †¢ It was a classic example of what happens to equilibrium prices when supply falls. Tortillas are made from corn; much of Mexico’s corn is imported from the United States, with the price of corn in both countries basically set in the U. S. corn market. And U. S. corn prices were rising rapidly thanks to surging demand in a new market: the market for ethanol. 35 of 42 Demand and Supply Shifts at Work in the Global Economy ? A recent drought in Australia reduced the amount of grass on which Australian dairy cows could feed, thus limiting the amount of milk these cows produced for export. At the same time, a new tax levied by the government of Argentina raised the price of the milk the country exported, thereby decreasing Argentine milk sales worldwide. These two developments produced a supply shortage in the world market, which dairy farmers in Europe couldn’t fill because of strict production quotas set by the European Union. ? ? 36 of 42 Demand and Supply Shifts at Work in the Global Economy ? In China, meanwhile, demand for milk and milk products increased, as rising income levels drove higher per-capita consumption. All these occurrences resulted in a strong upward pressure on the price of milk everywhere in 2007. ? 37 of 42 SUMMARY 1. The supply and demand model illustrates how a competitive market works. 2. The demand schedule shows the quantity demanded at each price and is represented graphically by a demand curve. The law of demand says that demand curves slope downward. 3. A movement along the demand curve occurs when a price change leads to a change in the quantity demanded. When economists talk of increasing or decreasing demand, they mean shifts of the demand curve—a change in the quantity demanded at any given price. 38 of 42 SUMMARY 4. There are five main factors that shift the demand curve: †¢ A change in the prices of related goods or services †¢ A change in income †¢ A hange in tastes †¢ A change in expectations †¢ A change in the number of consumers 5. The market demand curve for a good or service is the horizontal sum of the individual demand curves of all consumers in the market. 6. The supply schedule shows the quantity supplied at each price and is represented graphically by a supply curve. Supply curves usually slope upward. 39 of 42 SUM MARY 7. A movement along the supply curve occurs when a price change leads to a change in the quantity supplied. When economists talk of increasing or decreasing supply, they mean shifts of the supply curve—a change in the quantity supplied at any given price. 8. There are five main factors that shift the supply curve: †¢ A change in input prices †¢ A change in the prices of related goods and services †¢ A change in technology †¢ A change in expectations †¢ A change in the number of producers 9. The market supply curve for a good or service is the horizontal sum of the individual supply curves of all producers in the market. 40 of 42 SUMMARY 10. The supply and demand model is based on the principle that the price in a market moves to its equilibrium price, or market-clearing price, the price at which the quantity demanded is equal to the quantity supplied. This quantity is the equilibrium quantity. When the price is above its market-clearing level, there is a surplus that pushes the price down. When the price is below its market-clearing level, there is a shortage that pushes the price up. 11. An increase in demand increases both the equilibrium price and the equilibrium quantity; a decrease in demand has the opposite effect. An increase in supply reduces the equilibrium price and increases the equilibrium quantity; a decrease in supply has the opposite effect. 12. Shifts of the demand curve and the supply curve can happen simultaneously. 41 of 42 The End of Chapter 3 Coming attraction Chapter 4: The Market Strikes Back 42 of 42

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