Macroeconomic Uncertainty and Vector Autoregressions
2021
We estimate measures of macroeconomic uncertainty and compute the effects of uncertainty shocks by means of a new simple procedure based on standard VARs. Uncertainty and its effects are estimated using a single model so to ensure internal consistency. Under suitable assumptions, our procedure is equivalent to using the square of the VAR forecast error as an external instrument in a proxy SVAR. Our procedure allows to add orthogonality constraints to the standard proxy SVAR identification scheme. We apply our method to a US data set; we find that uncertainty is mainly exogenous and is responsible of a large fraction of business-cycle fluctuations.
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