宏观经济学ch01.ppt

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1、slide 0This chapter introduces you tothe issues macroeconomists studythe tools macroeconomists usesome important concepts in macroeconomic analysisslide 1Why does the cost of living keep rising?Why are millions of people unemployed, even when the economy is booming?Why are there recessions? Can the

2、government do anything to combat recessions? Should it?slide 2What is the government budget deficit? How does it affect the economy?Why does the U.S. have such a huge trade deficit? Why are so many countries poor? What policies might help them grow out of poverty?slide 33,0004,0005,0006,0007,0008,00

3、09,00010,0001970197519801985199019952000long-run upward trendslide 43,0004,0005,0006,0007,0008,0009,00010,0001970197519801985199019952000Recessionslongest economic expansion on recordslide 51.The macroeconomy affects societys well-being.example: Unemployment and social problemsslide 6Each one-point

4、increase in the unemployment rate is associated with: 920 more suicides 650 more homicides 4000 more people admitted to state mental institutions 3300 more people sent to state prisons 37,000 more deaths increases in domestic violence and homelessnessslide 71.The macroeconomy affects societys well-b

5、eing.example: Unemployment and social problems2.The macroeconomy affects your well-being.example 1: Unemployment and earnings growthexample 2:Interest rates and mortgage paymentsslide 8slide 9For a $150,000 30-year mortgage: $11,782$9816.84%Dec 2001$12,771$10647.65%Dec 2000annual paymentmonthly paym

6、entactual rate on 30-year mortgagedateslide 101.The macroeconomy affects societys well-being.example: Unemployment and social problems2.The macroeconomy affects your well-being.example 1: Unemployment and earnings growthexample 2:Interest rates and mortgage payments3.The macroeconomy affects politic

7、s & current events.example: Inflation and unemployment in election yearsslide 11year U rate inflation rate elec. outcome19767.7%5.8%Carter (D)19807.1%13.5%Reagan (R)19847.5%4.3%Reagan (R)19885.5%4.1%Bush I (R)19927.5%3.0%Clinton (D)19965.4%3.3%Clinton (D)20004.0%3.4%Bush II (R)slide 12are simplied v

8、ersions of a more complex reality irrelevant details are stripped awayUsed to show the relationships between economic variables explain the economys behavior devise policies to improve economic performanceslide 13explains the factors that determine the price of cars and the quantity sold.assumes the

9、 market is competitive: each buyer and seller is too small to affect the market priceVariables:Q d = quantity of cars that buyers demandQ s = quantity that producers supplyP = price of new carsY = aggregate incomePs = price of steel (an input)slide 14shows that the quantity of cars consumers demand

10、is related to the price of cars and aggregate income. demand equation: (,)dQD P Yslide 15General functional notation shows only that the variables are related:(,)dQD P YA list of the variables that affect Q dslide 16General functional notation shows only that the variables are related:(,)dQD P YA sp

11、ecific functional form shows the precise quantitative relationship:Examples:1) (,)60102dQD P YPY0.32) (,)dYQD P YPslide 17Q Quantity of carsP Price of carsDThe demand curve shows the relationship between quantity demanded and price, other things equal. demand equation: (,)dQD P Yslide 18Q Quantity o

12、f carsP Price of carsDsupply equation: (,)ssQS P PSThe supply curve shows the relationship between quantity supplied and price, other things equal. slide 19Q Quantity of carsP Price of carsSDequilibrium priceequilibriumquantityslide 20D2Q Quantity of carsP Price of carsSD1Q1P1An increase in income i

13、ncreases the quantity of cars consumers demand at each pricewhich increases the equilibrium price and quantity.P2Q2demand equation: (,)dQD P Yslide 21Q Quantity of carsP Price of carsS1DQ1P1An increase in Ps reduces the quantity of cars producers supply at each pricewhich increases the market price

14、and reduces the quantity.P2Q2S2supply equation: (,)ssQS P Pslide 22The values of endogenous variables are determined in the model.The values of exogenous variables are determined outside the model: the model takes their values & behavior as given.In the model of supply & demand for cars,endogenous:

15、, , dsPQQexogenous: , sYPslide 231.Write down demand and supply equations for wireless phones; include two exogenous variables in each equation. 2.Draw a supply-demand graph for wireless phones.3.Use your graph to show how a change in one of your exogenous variables affects the models endogenous var

16、iables. slide 24No one model can address all the issues we care about. For example, If we want to know how a fall in aggregate income affects new car prices, we can use the S/D model for new cars. But if we want to know why aggregate income falls, we need a different model. slide 25So we will learn different models for studying different issues (e.g. unemployment, inflation, long-run growth). For each new model, you should keep track of its assumptions, which of its variables are endogenous and