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IN THIS CHAPTER, YOU WILL LEARN: about the issues macroeconomists study about the tools macroeconomists use some important concepts in macroeconomic analysis

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Important issues in macroeconomics What causes recessions? What is “government stimulus” and why might it help? How can problems in the housing market spread to the rest of the economy? What is the government budget deficit? How does it affect workers, consumers, businesses, and taxpayers?

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Important issues in macroeconomics Why does the cost of living keep rising? Why are so many countries poor? What policies might help them grow out of poverty? What is the trade deficit? How does it affect the country’s well-being?

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U.S. Real GDP per capita (2005 dollars)

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U.S. Unemployment Rate (% of labor force)

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U.S. Inflation Rate (% per year)

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Economic models …are simplified versions of a more complex reality irrelevant details are stripped away …are used to show relationships between variables explain the economy’s behavior devise policies to improve economic performance

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Endogenous vs. exogenous variables The values of endogenous variables are determined in the model. The values of exogenous variables are determined outside the model: the model takes their values and behavior as given. In the model of supply & demand for cars, endogenous: P, Q d, Q s exogenous: Y, Ps

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Example of a model: Supply & demand for new cars shows how various events affect price and quantity of cars assumes the market is competitive: each buyer and seller is too small to affect the market price Variables Qd = quantity of cars that buyers demand Qs = quantity that producers supply P = price of new cars Y = aggregate income Ps = price of steel (an input)

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The demand for cars demand equation: Q d = D (P,Y ) shows that the quantity of cars consumers demand is related to the price of cars and aggregate income

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Digression: functional notation General functional notation shows only that the variables are related. Q d = D (P,Y ) A specific functional form shows the precise quantitative relationship. Example: D (P,Y ) = 60 – 10P + 2Y

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The market for cars: Demand

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The market for cars: Supply

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The market for cars: Equilibrium

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The effects of an increase in income

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The effects of a steel price increase

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NOW YOU TRY Supply and Demand 1. Write down demand and supply equations for smartphones; include two exogenous variables in each equation. 2. Draw a supply-demand graph for smartphones. 3. Use your graph to show how a change in one of your exogenous variables affects the model’s endogenous variables.

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The use of multiple models No one model can address all the issues we care about. E.g., our supply-demand model of the car market… can tell us how a fall in aggregate income affects price & quantity of cars. cannot tell us why aggregate income falls.

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The use of multiple models So 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 variables are endogenous, which are exogenous the questions it can help us understand, those it cannot

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Prices: flexible vs. sticky Market clearing: An assumption that prices are flexible, adjust to equate supply and demand. In the short run, many prices are sticky – adjust sluggishly in response to changes in supply or demand. For example: many labor contracts fix the nominal wage for a year or longer many magazine publishers change prices only once every 3 to 4 years

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Prices: flexible vs. sticky The economy’s behavior depends partly on whether prices are sticky or flexible: If prices sticky (short run), demand may not equal supply, which explains: unemployment (excess supply of labor) why firms cannot always sell all the goods they produce If prices flexible (long run), markets clear and economy behaves very differently

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Outline of this book: Introductory material (Chaps. 1, 2) Classical Theory (Chaps. 3–7) How the economy works in the long run, when prices are flexible Growth Theory (Chaps. 8, 9) The standard of living and its growth rate over the very long run Business Cycle Theory (Chaps. 10–14) How the economy works in the short run, when prices are sticky

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Outline of this book: Macroeconomic theory (Chaps. 15–17) Macroeconomic dynamics, models of consumer behavior, theories of firms’ investment decisions Macroeconomic policy (Chaps. 18–20) Stabilization policy, government debt and deficits, financial crises

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CHAPTER SUMMARY Macroeconomics is the study of the economy as a whole, including growth in incomes changes in the overall level of prices the unemployment rate Macroeconomists attempt to explain the economy and to devise policies to improve its performance.

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CHAPTER SUMMARY Economists use different models to examine different issues. Models with flexible prices describe the economy in the long run; models with sticky prices describe the economy in the short run. Macroeconomic events and performance arise from many microeconomic transactions, so macroeconomics uses many of the tools of microeconomics.

Теги Science Macroeconomics

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