曼昆宏观经济学ppt课件

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1、Government Debt and Budget Deficits,16,In this chapter, you will learn:,about the size of the U.S. governments debt, and how it compares to that of other countries problems measuring the budget deficit the traditional and Ricardian views of the government debt other perspectives on the debt,Indebted

2、ness of the worlds governments,Ratio of U.S. govt debt to GDP,The U.S. experience in recent years,Early 1980s through early 1990s debt-GDP ratio: 25.5% in 1980, 48.9% in 1993 due to Reagan tax cuts, increases in defense spending & entitlements Early 1990s through 2000 $290b deficit in 1992, $236b su

3、rplus in 2000 debt-GDP ratio fell to 32.5% in 2000 due to rapid growth, stock market boom, tax hikes,The U.S. experience in recent years,Early 2000s the return of huge deficits, due to Bush tax cuts, 2001 recession, Iraq war The 2008-2009 recession fall in tax revenues huge spending increases (bailo

4、uts of financial institutions and auto industry, stimulus package),The troubling long-term fiscal outlook,The U.S. population is aging. Health care costs are rising. Spending on entitlements like Social Security and Medicare is growing. Deficits and the debt are projected to significantly increase,P

5、ercent of U.S. population age 65+,Percent of pop.,5,8,11,14,17,20,23,1950,1960,1970,1980,1990,2000,2010,2020,2030,2040,2050,actual,projected,U.S. government spending on Medicare and Social Security,Percent of GDP,CBO projected U.S. federal govt debt in two scenarios,Percent of GDP,0,50,100,150,200,2

6、50,300,2005,2010,2015,2020,2025,2030,2035,2040,2045,2050,Problems measuring the deficit,1.Inflation 2.Capital assets 3.Uncounted liabilities 4.The business cycle,MEASUREMENT PROBLEM 1: Inflation,Suppose the real debt is constant, which implies a zero real deficit. In this case, the nominal debt D gr

7、ows at the rate of inflation: D/D = or D = D The reported deficit (nominal) is D even though the real deficit is zero. Hence, should subtract D from the reported deficit to correct for inflation.,MEASUREMENT PROBLEM 1: Inflation,Correcting the deficit for inflation can make a huge difference, especi

8、ally when inflation is high. Example: In 1979, nominal deficit = $28 billion inflation = 8.6% debt = $495 billion D = 0.086 $495b = $43b real deficit = $28b $43b = $15b surplus,MEASUREMENT PROBLEM 2: Capital Assets,Currently, deficit = change in debt Better, capital budgeting:deficit = (change in de

9、bt) (change in assets) EX: Suppose govt sells an office building and uses the proceeds to pay down the debt. under current system, deficit would fall under capital budgeting, deficit unchanged, because fall in debt is offset by a fall in assets. Problem w/ cap budgeting: Determining which govt expen

10、ditures count as capital expenditures.,MEASUREMENT PROBLEM 3: Uncounted liabilities,Current measure of deficit omits important liabilities of the government: future pension payments owed to current govt workers future Social Security payments contingent liabilities, e.g., covering federally insured

11、deposits when banks fail (Hard to attach a dollar value to contingent liabilities, due to inherent uncertainty.),CASE STUDY: Accounting for TARP,Troubled Asset Relief Program (TARP): The U.S. Treasury gave money to help struggling banks. In return, the Treasury became part owner of the banks, will r

12、eceive dividends, will eventually relinquish ownership when banks repay principal.,CASE STUDY: Accounting for TARP,Should the TARP outlays count toward the deficit? The U.S. Treasury considered TARP outlays to be expenditures that increased the deficit, and will consider bank repayments as revenues

13、that will reduce the deficit. Congressional Budget Office (CBO) counted the net present value of the program outlays minus eventual repayments adjusted for the risk of non-repayment. This works out to 25 cents for each dollar spend on TARP.,MEASUREMENT PROBLEM 4: The business cycle,The deficit varie

14、s over the business cycle due to automatic stabilizers (unemployment insurance, the income tax system). These are not measurement errors, but do make it harder to judge fiscal policy stance. E.g., is an observed increase in deficit due to a downturn or an expansionary shift in fiscal policy?,MEASURE

15、MENT PROBLEM 4: The business cycle,Solution: cyclically adjusted budget deficit (aka “full-employment deficit”) based on estimates of what govt spending & revenues would be if economy were at the natural rates of output & unemployment.,The actual and cyclically adjusted U.S. Federal budget surpluses

16、/deficits,actual,cyclically-adjusted,The bottom line,We must exercise care when interpreting the reported deficit figures.,Is the govt debt really a problem?,Consider a tax cut with corresponding increase in the government debt. Two viewpoints: 1.Traditional view 2.Ricardian view,The traditional view,Short run: Y, u Long run: Y and u back at their natural rates closed economy: r, I open economy: , NX (or higher trade defi

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