Origins and Nature of Macroeconomic Instability in Vector Autoregressions
VAR 中宏观经济不稳定性的来源与性质AI 解读 ↓
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AI 根据所提供的论文材料归类:摘要以宏观 TVP-VAR 分析参数不稳定性,强调结构冲击及参数变化的共同因子,对应 VAR、因子模型与结构变化。
VAR 中宏观经济不稳定性的来源与性质AI 解读 ↓
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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.