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ECONOMICS What does it mean to me? Part IV: •Supply & Demand •Shifts in Supply & Demand •Linked Markets •Complementary Goods •Substitute Goods •Change in Quantity Demanded •Change in Quantity Supplied READ Krugman Section 2, Module 5, 6, 7, 8, 9 Mankiw Ch 4, 5, 6 DO Morton Unit 2 LAW of SUPPLY LAW of DEMAND The LAW of DEMAND states that consumers are willing and able to consume less of a good as its price rises. …..or consume more of a good as its price $80 decreases. P $70 R I C E $60 $50 $40 $30 $20 D (demand) $10 0 100 200 300 400 500 600 QUANTITY Module 5 (Food, sleep, date, study, etc.) The Ps and Qs have an inverse relationship. Math: $80 P R I C E Economics: P = -mQ + b $70 $60 $50 $40 $30 $20 D (demand) $10 0 100 200 300 400 500 600 QUANTITY Module 5 Y = -mX + b (Food, sleep, date, study, etc.) Demand Schedule and Demand Curve Price Module 5 Price Quantity $8 3 $7 5 $6 7 $5 10 $4 12 $3 16 $2 22 Quantity Krugman, Economics for AP Understanding Shifts of the Demand Curve • Increase = right, Decrease = left • M.E.R.I.T. shifts demand • market size (number of consumers) • expectations • related prices (complements, substitutes) • income (normal, inferior) Module 5 • tastes Krugman, Economics for AP Table A-1 Novels Purchased by Emma *Mankiw Figure A-3 Demand Curve *Mankiw Figure A-4 Shifting Demand Curves *Mankiw Figure A-5 Calculating the Slope of a Line *Mankiw The LAW of SUPPLY states that producers are willing and able to produce more of a good as its price rises. S (supply) $80 P R I C E $70 $60 $50 $40 $30 $20 ….or produce less of a good as its price decreases. $10 0 100 200 300 400 500 600 QUANTITY Module 6 (Food, sleep, date, study, etc.) The Ps and Qs have an direct relationship. Math: Y = mX + b Economics: P = mQ + b S (supply) $80 P R I C E $70 $60 $50 $40 $30 $20 $10 0 Module 6 100 200 300 400 500 600 QUANTITY (Food, sleep, date, study, etc.) Supply Schedule and Supply Curve Price Module 6 Quantity Price Quantity $8 22 $7 14 $6 8 $5 6 $4 5 $3 4 $2 3 Understanding Shifts of the Supply Curve • Increase = right, decrease = left • T.R.I.C.E. shifts supply • Technology • Related prices (complements in production, substitutes in production) • Input prices • Competition (number of producers) Module 6 • Expectations Putting these two curves together gives us the point of EQUILIBRIUM…equilibrium gives us the optimum point of production at the price people are willing to pay. $80 P R I C E $70 $60 $50 E (equilibrium) $40 $30 $20 D (demand) $10 0 Module 6 S (supply) 100 200 300 400 500 600 QUANTITY (Food, sleep, date, study, etc.) Supply, Demand, and Equilibrium Equilibrium Equilibrium price Equilibrium quantity Market-clearing price Module 6 Finding the Equilibrium Price and Quantity equilibrium price Module 6 E equilibrium quantity equilibrium Why Does the Market Price Fall If It Is Above the Equilibrium Price? • Surplus • Producer's Incentive Module 6 Why Does the Market Price Rise If It is Below the Equilibrium Price? • Shortage • Consumer's Incentive • The tendency towards equilibrium Module 6 In a market economy, the price of a good signals to consumers the cost of producing a good. MARKET PRICE also signals to producers the value that consumers place on a good. Market price coordinates the actions of consumers (demand) and producers (supply). What happens when changes occur in the economy? How do these changes affect supply and demand? The Chicago Cubs have a winning season. What happens to the price of World Series tickets? Does this affect the supply or demand curve? Chart I: Demand increase (P ; Q ) The Chicago Cubs have a winning season. What happens to the price of World Series tickets? S Price goes up E1 P P1 R P0 I E0 C E D1 D0 Q0 Q1 QUANTITY Quantity goes up What Happens When the Demand Curve Shifts? Module 6 • When demand increases, the equilibrium price and quantity both increase Gas prices increase dramatically. What happens to the market for big automobiles? Does this affect the supply or demand curve? Chart II: Demand decrease (P ; Q ) Gas prices increase dramatically. What happens to the market for big automobiles? S Price goes down P R P0 I P1 C E E0 E1 D1 Q1 Q0 QUANTITY D0 Quantity goes down What Happens When the Demand Curve Shifts? • When demand decreases, the equilibrium price and Module 6 quantity both decrease Plentiful oil fields are discovered in Nevada. What happens to the market for oil? Does this affect the supply or demand curve? Chart III: Supply Increase (P ; Q ) Plentiful oil fields are discovered in Nevada. What happens to the market for oil? S0 Price goes down S1 P R P0 I P1 C E E0 E1 D Q0 Q1 QUANTITY Quantity goes up What Happens When the Supply Curve Shifts? Module 6 • When supply increases, the equilibrium price decreases and the equilibrium quantity increases A drought has depleted the corn crop. What happens to the market for corn? Does this affect the supply or demand curve? Chart IV: Supply Decrease (P ; Q ) A drought has depleted the corn crop. What happens to the market for corn? S1 S0 Price goes up P P1 R P0 I E1 E0 C E D Q1 Q0 QUANTITY Quantity goes down What Happens When the Supply Curve Shifts? • When supply decreases, the equilibrium price Module 6 increases and the equilibrium quantity decreases http://www.yadayadayadaecon.com/clip/18/ Let’s look at a shift using numbers: The government adds a $1 tax to cigarettes. Does this affect supply or demand? Chart IV: Supply Decrease (P ; Q ) Congress adds $1 tax to cigarettes. S1 S0 $6 Price goes up P R I C E $5 $4 $3 This area represents the $1 tax. E1 E0 $2 D $1 0 1K 2K 3K 4K 5K QUANTITY Quantity goes down Demand and Supply: Single Markets where both curves shift. Now let’s see what happens when an event occurs and impacts both the supply and the demand…. What is the short term impact of the government legalizing marijuana? Will this affect the supply curve or the demand curve? Or both? Chart V: (D ; S ) What is the short term impact of the government legalizing marijuana? S The demand curve moves right P indicating an increase. R P 0 The supply C curve moves E right indicating an increase. E1 E0 I S1 D1 D0 Q0 QUANTITY Q1 Chart V: (D ; S ) This chart shows and increase in both supply and demand. As a result: S PRICE P0 S1 E1 E0 D1 D0 Q0 Q1 QUANTITY Quantity will increase Simultaneous Shifts of Supply and Demand • When demand and supply increase, the change in Module 7 equilibrium price is ambiguous, but equilibrium quantity definitely increases Frost hits coffee growing areas, while coffee is “cleared” as a cause of cancer. Will this affect the supply curve or the demand curve? Or both? Chart VI: (D ; S ) Frost hits coffee growing areas, while coffee is “cleared” as a cause of cancer. S The demand curve moves P1 right P indicating an increase. R P 0 E1 S0 E0 I The supply C curve moves E left indicating an decrease. 1 D1 D0 Q0 QUANTITY Chart VI: (D ; S ) In this chart, demand will increase while supply decreases. This will result in: S 1 E1 P S0 P1 Price will R P0 increase. E0 I C E D1 D0 Q0 QUANTITY Quantity will be indeterminate. Simultaneous Shifts of Supply and Demand • When demand increases and supply decreases the Module 7 equilibrium price definitely increases, but quantity is ambiguous A sturdy, shippable tomato that tastes like cardboard is introduced into the market. Will this affect the supply curve or the demand curve? Or both? Chart VII: (D ; S ) A sturdy, shippable tomato that tastes like cardboard is introduced into the market. S0 The demand S1 curve moves left P indicating an decrease. R P E I 0 The supply C P 1 curve moves E right indicating an increase. 0 E1 D1 Q0 QUANTITY D0 Chart VII: (D ; S ) When demand is decreased and supply is increased, this results in: S0 PRICE Price will decrease. P0 E0 P1 E1 D1 Q0 S1 D0 Quantity will be QUANTITY indeterminate. Simultaneous Shifts of Supply and Demand • When demand decreases and supply increases the Module 7 equilibrium price definitely decreases, but quantity is ambiguous Newspapers report high levels of salmonella in chickens, many must be destroyed. Will this affect the supply curve or the demand curve? Or both? Chart VIII: (D ; S ) Newspapers report high levels of salmonella in chickens, many must be destroyed. S1 S0 The demand curve moves left P indicating E1 an decrease. R P E I The supply C curve moves E left indicating an decrease. 0 0 D1 Q1 Q0 QUANTITY D0 Chart VIII: (D ; S ) This chart shows what happens when demand and supply are both decreased. S1 S0 PRICE E1 P0 E0 D1 Q1 Q0 D0 QUANTITY Quantity will decrease Simultaneous Shifts of Supply and Demand • When demand and supply decrease, the change in Module 7 equilibrium price is ambiguous, but equilibrium quantity definitely decreases LINKED MARKETS LINKED MARKETS pertain to those goods which affect other goods. For instance: Coffee => Cream Peaches => Blueberries Vegetarianism => Leather Coats Coffee beans are hit by an unusual frost. What happens to the price and quantity of cream? Which of the charts (I, II, III, or IV) will pertain to these markets? Chart IV represents the depleted coffee crop. Price goes up Quantity goes down The demand for cream decreases as graphed in Chart II. Price goes down Quantity goes down So, a decrease in the supply of coffee causes the price of coffee to rise. People who do not want to pay the high price for coffee will have a reduced demand for cream to go into the coffee. Coffee and cream are considered complementary goods. A complementary good is defined as a good who, when its price rises causes a decrease in the demand of another good (or visa versa). Complementary goods have an inverse relationship between price of one good and demand for another. Pa Db Pa Db A virus attacks broccoli. What happens to the price and quantity of brussels sprouts? Which of the charts (I, II, III, or IV) will pertain to these markets? Chart IV represents the depleted broccoli crop. Price goes up Quantity goes down Chart I represents the increase in demand of brussels sprouts. Price goes up Quantity goes up So, the virus creates a diminished supply of broccoli which drives up the price. Consumers who don’t wish to pay the higher price will look for a substitute good such as brussels sprouts. A substitute good is defined as a good who, when its price rises causes a increase in the demand of another good (or visa versa). Substitute goods have a direct relationship between price of one good and demand for another. Pa Db Pa Db Which of the charts (I, II, III, or IV) will pertain to these markets? The demand for the new cloth increases as graphed in Chart I. Price goes up Quantity goes up The demand for cotton decreases as graphed in Chart II. Price goes down Quantity goes down So…..people using, or demanding, less cotton will cause the price to go down and less of the fabric to be made. Are these goods substitute or complementary? Vegetarianism expands greatly, what happens to the P & Q of leather coats? Which of the charts (I, II, III, or IV) will pertain to these markets? Chart I shows what happens to the P & Q of vegetables. Price goes up Quantity goes up The demand for beef decreases as graphed in Chart II. Price goes down Quantity goes down Chart IV shows what happens to the P & Q of leather coats. Price goes up Quantity goes down So…..the increase in the purchase of vegetables will create a lack of demand for beef. This will cause fewer cows to be slaughtered, creating less leather to be available, or a decrease in supply, which will cause the price to go up on leather coats. http://www.yadayadayadaecon.com/clip/86/ http://www.yadayadayadaecon.com/clip/60/ Economics is mostly about changes--not levels. Several years ago, Baby M was born to a surrogate mother who had been paid $10,000 to give birth to the baby. The birth mother changed her mind and sued in court to have the child returned to her. The judge agreed. What impact did this have on the supply of surrogate mothers? What impact did this have on the demand for babies born to surrogate mothers? Exercise One: Using supply and demand analysis, explain why the price of roses always seems to rise just before Valentine’s Day. Using supply and demand analysis, determine how a freeze that kills half the rose crop would affect the price of roses. Using supply and demand analysis, determine how a freeze that kills half the rose crop would affect the price of fine chocolates. Exercise Two: Some time ago,the city of Ft.Lauderdale had an initiative on the general election ballot that asked voters to raise the minimum wage in that city to a level 40 percent above the national minimum wage. This year the initiative would make the minimum wage be $7.35 in Ft. Lauderdale and $5.25 elsewhere. •How would things in Ft. Lauderdale have changed if the initiative had passed? •What would be the same? •What would change? •Predict the effect of the legislation on the markets for labor in Ft. Lauderdale and in the suburbs outside the city. •Would you rather work in Ft. Lauderdale or outside the city •Would you be more likely to find a job in Ft. Lauderdale or outside the city? There is a small business person who is planning to re-locate to the Ft. Lauderdale area. *Would you advise the business person to set up business in Ft. Lauderdale or in a suburb of Ft. Lauderdale? What is your reasoning? Exercise Three: Suppose you run a lawn mower business. You charge $15 per standard size lawn and can mow five lawns in an eight hour day. You currently have more people asking you to mow their lawns than you can satisfy and estimate that you could sign up as many as 25 additional customers. You have two strategies that will permit you to expand your business. Strategy One…….is to hire your friend Jim to work for you. Jim is a good worker who will work for $8 an hour. Strategy Two….is to rent a riding lawn mower that will permit you to mow seven lawns per day. Rent for the riding mower is $100 per week. Gas and oil for the mower cost $25 per week. OPTION 0: Actually, there are 3 options--the first being “status quo.” ($15 per lawn) X (25 lawns per week) = $375 per week OPTION 1: Hire Jim to work by the hour. It takes him 8 / 5 = 1.6 hours to mow a lawn Marginal Revenue per lawn = $15 Marginal loss per lawn = ($8 per hour) X (1.6 hours to mow) = $12.80 $15 - 12.80 = $2.20 extra profit per lawn If Jim mows 25 lawns per week: 25 X $2.20 = $55 profit per week YOUR NET REVENUE IS: $375 + 55 = $430 OPTION 2: Rent Lawn Mower MARGINAL REVENUE (7 lawns per day) X (5 days) = 35 lawns per week 35 lawns X $15 per lawn = $525 MARGINAL LOSS = $125 YOUR NET REVENUE IS: $525 -125 = $400 •Should you expand your business? Why or why not? •Which strategy, if any, should you use? Why? •If the riding lawn mower permitted you to mow 8 lawns per day, would your strategy change? Why or why not? OPTION 4: Rent Lawn Mower (8 lawns per day) MARGINAL REVENUE (8 lawns per day) X (5 days) = 40 lawns per week 40 lawns X $15 per lawn = $600 MARGINAL LOSS = $125 YOUR NET REVENUE IS: $600 -125 = $475 THE END Compiled by Virginia Meachum, Economics Teacher, Coral Springs High School, Broward County, FL