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Author:Wu, Huabin 

Journal Article
Dynamics of externalities: a second-order perspective

First-order approximation methods are a standard technique for analyzing the local dynamics of dynamic stochastic general equilibrium (DSGE) models. Although linear methods yield quite accurate solutions for a broad class of DSGE models, some important economic issues (e.g., portfolio choice and welfare) cannot be adequately addressed by first-order methods. This paper provides yet another case when first-order methods may be inadequate for capturing the business cycle properties of a DSGE model. In particular, the authors show that increasing returns to scale (due to production ...
Review , Volume 93 , Issue May , Pages 187-206

Working Paper
Dynamics of externalities: a second-order perspective

We show that increasing returns to scale (due to production externalities) may induce a strong degree of asymmetric income effects and nonlinear dynamics that are not fully appreciated by linear approximation methods. For example, hump-shaped output dynamics can emerge even when externalities are significantly below the threshold level required for indeterminacy, and output expansion tends to be smoother and longer while contraction tends to be deeper but shorter-lived. Thus, mild degree of externalities without triggering indeterminacy can potentially explain the asymmetric property of the ...
Working Papers , Paper 2008-044

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