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Diffusion of technical change and the decomposition of output into trend and cycle

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  • Marco Lippi
  • Lucrezia Reichlin

Abstract

In this paper we argue that modelling the trend component in real GNP as a random walk is inconsistent with its interpretation as productivity growth. As an alternative we specify the trend as an Auto Regressive Integrated Moving Average (ARIMA) process, whose impulse response function follows an S-shaped pattern reflecting the process of diffusion of technical change. Such an ARIMA process is employed to build and estimate an Unobserved Components ARIMA (UCARIMA) model using USA post-war quarterly data. We find that our model, although more parsimonious, fits the data as well as the standard random walk plus AR(2) cycle. Moreover, the cycle has a very low variance relative to the variance of the trend in our model.

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Bibliographic Info

Paper provided by ULB -- Universite Libre de Bruxelles in its series ULB Institutional Repository with number 2013/10157.

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Date of creation: Jan 1994
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Publication status: Published in: The Review of Economic Studies (1994) v.61 n° 1,p.19-30
Handle: RePEc:ulb:ulbeco:2013/10157

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