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Perturbations in DSGE models: An odd derivatives theorem

机译:DSGE模型中的扰动:奇数导数定理

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This paper extends a classical result in portfolio theory about the effect of risk on value functions to its effect more generally on policy functions. If odd moments of shocks are zero up to some order, then the odd order marginal effects on value and policy functions of introducing these shocks are zero as well. Mathematically, all coefficients of corresponding odd order in the perturbation parameter are zero. If shocks are symmetric, e.g. normally distributed, then this holds for all odd orders. The main theorem (1) generalizes past results on perturbations and unifies their economic intuition, (2) improves the computation of stochastic coefficients, and (3) illustrates how to derive properties of high order perturbations through simple induction. (C) 2019 Elsevier B.V. All rights reserved.
机译:本文将投资组合理论中有关风险对价值功能的影响的经典结果扩展到其对政策功能的影响。如果冲击的奇数矩在某些阶数上为零,那么对引入这些冲击的价值和政策功能的奇数阶边际效应也为零。在数学上,扰动参数中所有对应奇数阶的系数均为零。如果震动是对称的,例如正态分布,则适用于所有奇数阶。主定理(1)概括了过去关于扰动的结果并统一了它们的经济直觉,(2)改进了随机系数的计算,并且(3)说明了如何通过简单归纳来导出高阶扰动的性质。 (C)2019 Elsevier B.V.保留所有权利。

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