Burren, Daniel (January 2008). The Role of Sectoral Shifts in the Great Moderation (Discussion Papers 0801). Bern: Department of Economics

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In this paper, I study the drop of real GDP volatility which has been observed in the United States during the postwar period. This paper thoroughly estimates how much sectoral shifts contributed to this phenomenon called the Great Moderation. In a short section, Stock and Watson (2003) find that this contribution is negligible, however, their data is disaggregated only up to 10 sectors. Blanchard and Simon (2001) come to the same result. Using a new estimation method and more disaggregated data, I find that sectoral shifts contributed between 15% and 30% to the great moderation. Moreover, I find that if in the year 1949 sectoral shares had been equal to what they were in 2005, then the conditional and
unconditional standard deviation of GDP growth would have been, on average, 2025% lower in the postwar period. Finally, I find that the shift out of durable goods production has significantly stabilized real GDP growth. As a methodological contribution, I show how to use the particle filter to estimate latent covariance matrices when they follow a Wishart
autoregressive process of order one I use this in order to get, for each observation period, an estimation of the covariance matrix of the sectoral growth rates. Since real GDP growth is the sum of these sectoral growth rates weighted by the sectoral shares, it is then straightforward to use these covariance matrices to express the conditional variance of GDP growth in each period as a function of sectoral shares. Computing the unconditional
variance of GDP growth as a function of sectoral shares is a bit more involved, but also quite easy using Monte Carlo simulations. My methodology to estimate covariance matrices is preferable to alternatives like estimating a multivariate GARCH model or using
a NadarayaWatson estimator for the following reasons: The multivariate GARCH model has undesirable properties for the Monte Carlo simulations and involves estimating a large number of parameters. The NadarayaWatson estimator, on the other hand, does not guarantee to give positive definite covariance matrices due to the limited number of observations available for estimating the relatively big covariance matrices.
Item Type: 
Working Paper 

Division/Institute: 
03 Faculty of Business, Economics and Social Sciences > Department of Economics 
UniBE Contributor: 
Burren, Daniel 
Subjects: 
300 Social sciences, sociology & anthropology > 330 Economics 
Series: 
Discussion Papers 
Publisher: 
Department of Economics 
Language: 
English 
Submitter: 
Lars Tschannen 
Date Deposited: 
06 Oct 2020 16:24 
Last Modified: 
06 Oct 2020 16:24 
JEL Classification: 
C11, C32, E32 
BORIS DOI: 
10.7892/boris.145706 
URI: 
https://boris.unibe.ch/id/eprint/145706 