Advanced Macroeconomics II. Economic Fluctuations: Concepts and Evidence. Jordi Galí. Universitat Pompeu Fabra April 2018
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1 Advanced Macroeconomics II Economic Fluctuations: Concepts and Evidence Jordi Galí Universitat Pompeu Fabra April 2018
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4 Business cycles: recurrent uctuations in the level of economic activity - economy-wide - re ected in variations in growth rates of output, employment, etc. - not periodic! economic uctuations
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12 Business cycles: recurrent uctuations in the level of economic activity - economy-wide - re ected in variations in growth rates of output, employment, etc. - not periodic! economic uctuations Key questions: What are the main features of observed uctuations? Have they changed over time? Do they di er across countries? What are their ultimate causes? How are they propagated? What is the role of policy? Is stabilization possible? Is it desirable?
13 Math Preliminaries Natural logarithm: Approximation: Application: Y y log Y Y Y ' y y Y t Y t 1 Y t 1 = y t y t 1 y t Constant growth rate, y t = t
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15 Trends and Cycles Time series: y 1 ; y 2 ; y 3 ; :::; y T () fy t g Decomposition: z t : trend x t : cycle y t = z t + x t Di erent "detrending" methods
16 The Business Cycle peak recession expansion trend trough trough
17 Example (I): Di erences First-di erence: x t = y t y t 1 Interpretation as a growth rate Limitation: too much weight given to high-frequency variations unrelated to business cycles. k-period di erences: x t = y t y t k Example: with quarterly data, k = 4: year-on-year growth rate
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20 Example (II): Deterministic Trend Linear: OLS estimation: Cyclical component: Generalization: min 0 ; 1 z t = t TX [y t ( t)] 2 t=1 x t = y t (b 0 + b 1 t) z t = t + 2 t 2 + ::: + q t q Limitation: many macroeconomic variables have a "stochastic trend" (Nelson and Plosser (JME 1982))
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22 Example (III): Moving Average Centered: z t = y t+q + ::: + y t+1 + y t + y t 1 + ::: + y t q 2q + 1 One-sided: z t = y t + y t 1 + ::: + y t q q + 1 Limitation: ignores observations far in time
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24 Other Examples (IV): General lter: z t = KX k= K k y t+k Hodrick-Prescott lter (Hodrick and Prescott (JMCB 1997)) - Parameter determines the smoothness of the trend component - Limitation: does not eliminate high-frequenct variations "Band-Pass" lter (Baxter and King (Restat 1999)) - Choice of frequency band for cyclical component (e.g quarters)
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27 corr=0.95
28 corr=0.59
29 Characterizing Economic Fluctuations fx t g: cyclical component of a variable of interest (with zero mean). Amplitude! standard deviation: (x t ) p (1=T ) P x 2 t Persistence! autocorrelation: corr(x t ; x t 1 ) cov(x t;x t 1 ) 2 (x t ) where cov(x t ; x t 1 ) (1=T ) P x t x t 1 Cyclicality! correlation with output: corr(x t ; y t ) cov(x t;y t ) (x t )(y t ) where cov(x t; y t ) (1=T ) P x t y t procyclical (+), countercyclical ( ), o acyclical (' 0) Evidence for US and Euro Area Economies
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31 corr= -0.57
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34 Properties of Economic Fluctuations: Summary Consumption and investment - highly procyclical - volatility ranking: (c t ) < (y t ) < (i t ) Employment: - highly procyclical - (n t ) ' (y t ) in the U.S., (n t ) < (y t ) in the euro area Productivity (labor and total): - procyclical Wages and interest rates - less volatile than GDP - largely acyclical Properties "robust" to di erent detrending methods and across countries.
35 The International Component of the Business Cycle Is there a "global" business cycle?
36 Source: Dallas Fed
37 ea us ea us corr( y t, y ) = 0.58 corr( y t, y 1 ) = t t
38 The Evolution of Business Cycles Over Time Long term evolution
39 Source: Backus and Kehoe (1992)
40 Source: WEO April 2002
41 The Evolution of Business Cycles Over Time Long term evolution Postwar evolution: - the "Great Moderation" - the "Great Recession"
42 s.d.= 1.93 s.d.= 0.94
43 s.d.= 1.17 s.d.= 0.51
44 The Evolution of Business Cycles Over Time Long term evolution Postwar evolution: - the "Great Moderation" - the "Great Recession" Explanations a) larger weight of services b) role of government - larger weight in aggregate demand - automatic stabilizers - countercyclical policies c) fewer nancial crises (deposit insurance, lender of last resort) d) nancial development e) good luck
45 Business Cycle Chronologies Dates that mark the beginning and end of recessions ("peaks" and "troughs") National Bureau of Economic Research (NBER) monthly and quarterly chronologies for the U.S. - recession: signi cant decline in economic activity, economy wide, lasting longer than a few months, and re ected in aggregate indicators like GDP, employment, personal income, etc complete cycles since average duration of recessions: 11 months. - average duration of expansions: 58 months. - last recession: "peak": December 2007 (Q4); "trough": June 2009 (Q2).
46 Centre for Economic Policy Research (CEPR) quarterly chronology for the euro area - recession: signi cant decline in economic activity, a ecting most countries in the euro area wide, usually re ected in two or more consecutive quarters of GDP and employment decline. - 5 complete cycles since last recessions: "peak": 2008Q1 ; "trough": 2009Q2 "peak" 2011Q3 ; "trough": 2013Q1
47 Source of Macroeconomic Data Global - IMF ( - OECD ( United States - St. Louis Fed ( - Bureau of Labor Statistics ( - Bureau of Economic Analysis ( Europe/Euro area - Eurostat ( ) - European Central Bank ( Espanya/Catalunya - Instituto Nacional de Estadística ( - Banco de España ( - Institut d Estadística de Catalunya (
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