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Diffusion of Technical Change and the Decomposition of Output into Trend and Cycle

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  • Lippi, Marco
  • Reichlin, Lucrezia

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.

Suggested Citation

  • Lippi, Marco & Reichlin, Lucrezia, 1993. "Diffusion of Technical Change and the Decomposition of Output into Trend and Cycle," CEPR Discussion Papers 775, C.E.P.R. Discussion Papers.
  • Handle: RePEc:cpr:ceprdp:775
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    References listed on IDEAS

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    1. Lucas, Robert Jr., 1972. "Expectations and the neutrality of money," Journal of Economic Theory, Elsevier, vol. 4(2), pages 103-124, April.
    2. Francesco Giavazzi & Marco Pagano, 1991. "The Advantage of Tying One's Hands: EMS Discipline and Central Bank Credibility," NBER Chapters,in: International Volatility and Economic Growth: The First Ten Years of The International Seminar on Macroeconomics, pages 303-330 National Bureau of Economic Research, Inc.
    3. Phelps, Edmund S & Taylor, John B, 1977. "Stabilizing Powers of Monetary Policy under Rational Expectations," Journal of Political Economy, University of Chicago Press, vol. 85(1), pages 163-190, February.
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    More about this item

    Keywords

    Non-Stationarity; Productivity Growth; Random Walk;

    JEL classification:

    • E32 - Macroeconomics and Monetary Economics - - Prices, Business Fluctuations, and Cycles - - - Business Fluctuations; Cycles
    • E37 - Macroeconomics and Monetary Economics - - Prices, Business Fluctuations, and Cycles - - - Forecasting and Simulation: Models and Applications
    • O49 - Economic Development, Innovation, Technological Change, and Growth - - Economic Growth and Aggregate Productivity - - - Other

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