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The Dynamic Effects of Aggregate Demand and Supply Disturbances


Olivier J. Blanchard


International Monetary Fund (IMF); National Bureau of Economic Research (NBER)

Danny Quah


London School of Economics & Political Science (LSE) - Department of Economics; National Bureau of Economic Research (NBER); Centre for Economic Policy Research (CEPR)

March 1990

NBER Working Paper No. w2737

Abstract:     
We interpret fluctuations in GNP and unemployment as due to two types of disturbances: disturbances that have a permanent effect on output and disturbances that do not. We interpret the first as supply disturbances, the second as demand disturbances. We find that demand disturbances have a hump shaped effect on both output and unemployment; the effect peaks after a year and vanishes after two to five years. Up to a scale factor, the dynamic effect on unemployment of demand disturbances is a mirror image of that on output. The effect of supply disturbances on output increases steadily over time, to reach a peak after two years and a plateau after five years. 'Favorab1e supply disturbances may initially increase unemployment. This is followed by a decline in unemployment, with a slow return over time to its original value. While this dynamic characterization is fairly sharp, the data are not as specific as to the relative contributions of demand and supply disturbances to output fluctuations. We find that the time series of demand-determined output fluctuations has peaks and troughs which coincide with most of the NBER troughs and peaks. But variance decompositions of output at various horizons giving the respective contributions of supply and demand disturbances are not precisely estimated. For instance, at a forecast horizon of four quarters, we find that, under alternative assumptions, the contribution of demand disturbances ranges from 40 to over 95 per cent.

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Date posted: July 7, 2004  

Suggested Citation

Blanchard, Olivier J. and Quah, Danny, The Dynamic Effects of Aggregate Demand and Supply Disturbances (March 1990). NBER Working Paper No. w2737. Available at SSRN: http://ssrn.com/abstract=226869

Contact Information

Olivier J. Blanchard (Contact Author)
International Monetary Fund (IMF) ( email )
700 19th Street, N.W.
Washington, DC 20431
United States
202 623 7825 (Phone)
202 623 7271 (Fax)
National Bureau of Economic Research (NBER)
1050 Massachusetts Avenue
Cambridge, MA 02138
United States
Danny Quah
London School of Economics & Political Science (LSE) - Department of Economics ( email )
Houghton Street
London WC2A 2AE
United Kingdom
+44 20 7955 7535 (Phone)
+44 20 7831 1840 (Fax)
HOME PAGE: http://econ.lse.ac.uk/~dquah/
National Bureau of Economic Research (NBER)
1050 Massachusetts Avenue
Cambridge, MA 02138
United States
Centre for Economic Policy Research (CEPR)
77 Bastwick Street
London, EC1V 3PZ
United Kingdom
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