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Numerical solution of continuous-time DSGE models under Poisson uncertainty

  • Olaf Posch

    ()

    (Aarhus University, Denmark)

  • Timo Trimborn

    (University of Hannover)

We propose a simple and powerful method for determining the transition process in continuous-time DSGE models under Poisson uncertainty numerically. The idea is to transform the system of stochastic differential equations into a system of functional differential equations of the retarded type. We then use the Waveform Relaxation algorithm to provide a guess of the policy function and solve the resulting system of ordinary differential equations by standard methods and fix-point iteration. Analytical solutions are provided as a benchmark from which our numerical method can be used to explore broader classes of models. We illustrate the algorithm simulating both the stochastic neoclassical growth model and the Lucas model under Poisson uncertainty which is motivated by the Barro-Rietz rare disaster hypothesis. We find that, even for non-linear policy functions, the maximum (absolute) error is very small.

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Paper provided by School of Economics and Management, University of Aarhus in its series Economics Working Papers with number 2010-08.

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Length: 33
Date of creation: 10 Jun 2010
Date of revision:
Handle: RePEc:aah:aarhec:2010-08
Contact details of provider: Web page: http://www.econ.au.dk/afn/

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