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Fundamental Problems with Nonfundamental Shocks

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  • Helmut Lütkepohl

Abstract

Economic agents using information that is not incorporated in the econometric model is seen as a possible reason for why nonfundamental shocks are important in econometric models. Allowing for nonfundamental shocks in structural vector autoregressive (SVAR) analysis by considering moving average (MA) representations with roots in the complex unit circle is a possible response to the problem. A case is made for viewing nonfundamentalness as an omitted variables problem rather than a problem of MA roots in the unit circle. The omitted variables problem will always lurk in the background of SVAR analysis as well as other econometric studies and cannot be avoided. In SVAR analysis it is even more problematic than what the literature on nonfundamental shocks suggests. Still, SVARs can be useful tools for empirical analysis.

Suggested Citation

  • Helmut Lütkepohl, 2012. "Fundamental Problems with Nonfundamental Shocks," Discussion Papers of DIW Berlin 1230, DIW Berlin, German Institute for Economic Research.
    • Handle: RePEc:diw:diwwpp:dp1230
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    4. Andrea Tafuro, 2015. "The Effects of Fiscal Policy on Employment: an Analysis of the Aggregate Evidence," Working Papers 2015: 03, Department of Economics, University of Venice "Ca' Foscari".

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    More about this item

    Keywords

    Structural vector autoregression; moving average representation; vector autoregressive moving average process; impulse response analysis; factor augmented VAR; Bayesian VAR;
    All these keywords.

    JEL classification:

    • C32 - Mathematical and Quantitative Methods - - Multiple or Simultaneous Equation Models; Multiple Variables - - - Time-Series Models; Dynamic Quantile Regressions; Dynamic Treatment Effect Models; Diffusion Processes; State Space Models

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