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arXiv 2512.20152econ.EM
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向量自回归中宏观经济不稳定性起源与本质

Origins and Nature of Macroeconomic Instability in Vector Autoregressions

University of Pennsylvania(宾夕法尼亚大学)

Pooyan Amir-Ahmadi, Marko Mlikota, Dalibor Stevanović

AI总结:

本文通过理论分析揭示了向量自回归中宏观经济不稳定性主要由少数结构性冲击驱动,并通过模型改进了预测效果。

摘要:

对于一般动态和随机的结构模型,我们证明了(i)经济动态中的非线性是减少形式VARMA过程中观测值中时间变化参数(TVPs)的必要且充分条件;(ii)所有参数的时间变化都由同一,通常少数的随机源驱动:结构性冲击。我们的结果质疑了TVPs通常被认为是由于

英文摘要:

For a general class of dynamic and stochastic structural models, we show that (i) non-linearity in economic dynamics is a necessary and sufficient condition for time-varying parameters (TVPs) in the reduced-form VARMA process followed by observables, and (ii) all parameters' time-variation is driven by the same, typically few sources of stochasticity: the structural shocks. Our results call into question the common interpretation that TVPs are due to "structural instabilities". Motivated by our theoretical analysis, we model a set of macroeconomic and financial variables as a TVP-VAR with a factor-structure in TVPs. This reveals that most instabilities are driven by a few factors, which comove strongly with measures of macroeconomic uncertainty and the contribution of finance to real economic activity, commonly emphasized as important sources of non-linearities in macroeconomics. Furthermore, our model yields improved forecasts relative to the standard TVP-VAR where TVPs evolve as independent random walks.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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