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Solving and simulating unbalanced growth models using linearization about the current state

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  • Phillips, Kerk L.

Abstract

This paper presents an adjustment to commonly used linear approximation methods for dynamic stochastic general equilibrium (DSGE) models. Policy functions approximated around the steady state will be inaccurate away from the steady state. In some cases the model may not have a well-defined steady state, or the nature of the steady state may be at odds with its off-steady-state dynamics. We show how to simulate a DSGE model with no well-defined steady state by approximating about the current state. Our method minimizes the error associated with a finite-order Taylor-series expansion of the model’s characterizing equations. This method is easily implemented and has the advantage of mimicking highly non-linear behavior. It also requires choosing N out of 2N possible roots from a matrix quadratic equations and the choice of this root not obvious away from the steady state. However, simulations show that using the same criteria as when linearizing about the steady state yield reasonable, well-fitting results.

Suggested Citation

  • Phillips, Kerk L., 2017. "Solving and simulating unbalanced growth models using linearization about the current state," Economics Letters, Elsevier, vol. 151(C), pages 35-38.
  • Handle: RePEc:eee:ecolet:v:151:y:2017:i:c:p:35-38
    DOI: 10.1016/j.econlet.2016.11.035
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    Cited by:

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    2. Natalia Vladimirovna Gryzunova & Victoria Ivanovna Pyatanova & Viktoriya Valeryevna Manuylenko & Konstantin Vasilievich Ordov, 2019. "Models of credit limit-setting for companies as means of encouraging competitiveness," Entrepreneurship and Sustainability Issues, VsI Entrepreneurship and Sustainability Center, vol. 7(1), pages 615-625, September.

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    More about this item

    Keywords

    Dynamic stochastic general equilibrium; Linearization methods; Numerical simulation; Computational techniques; Simulation modeling; Unbalanced growth;
    All these keywords.

    JEL classification:

    • C63 - Mathematical and Quantitative Methods - - Mathematical Methods; Programming Models; Mathematical and Simulation Modeling - - - Computational Techniques
    • C68 - Mathematical and Quantitative Methods - - Mathematical Methods; Programming Models; Mathematical and Simulation Modeling - - - Computable General Equilibrium Models
    • E37 - Macroeconomics and Monetary Economics - - Prices, Business Fluctuations, and Cycles - - - Forecasting and Simulation: Models and Applications

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