Spillover effects of disaggregated macroeconomic uncertainties on US real activity: evidence from the quantile vector autoregressive connectedness approach

This paper employs a quantile vector autoregressive approach to compare the extent of connectedness between macroeconomic uncertainty and U.S. real activity in normal and extreme economic and financial conditions. Based on a database ranging from January 1960 to February 2023 and using the methodology of Jurado et al. (Am Econ Rev 105(3):1177-1216, 2015), we derive, first, eight real and financial uncertainty measures based on 134 macroeconomic indicators. Second, we examine the quantile connectedness among the eight estimated macroeconomic uncertainties and real activity. The results indicate that real activity is strongly (weakly) influenced by the extremely high (low) values of the real and financial uncertainty estimates, indicating asymmetric spillover effects of US macroeconomic uncertainties on real economic activity. Among the real and financial uncertainty estimates, the real output uncertainty blocks are the most important transmitters of shocks to real activity under looser economic and financial conditions. However, under tighter economic and financial conditions, higher output and income and stock market uncertainty blocks are the major spillover transmitters of shocks to real activity. Finally, connectedness between macroeconomic uncertainties and real activity exhibits the highest level during the recent COVID-19 pandemic outbreak at various quantiles.