“…These can arise from structural breaks (Hiemstra & Jones, 1994); variation in the pattern of reaction to the flow of information (Bird & Yeung, 2012;Ross, 1989); bubbles with self-fulfilling expectations (Blanchard & Watson, 1982;Chahrour & Jurado, 2018); nonlinear monetary policies (Flood & Isard, 1989); and the action of noise traders (Black, 1986;Francis, Mougoué, & Panchenko, 2010;Long, Shleifer, Summers, & Waldmann, 1990). For uncertainty in Brazil, high volatility can generate nonlinearities in the series (Ferreira, Oliveira, Lima, & Barros, 2017), and persistence of shocks of different signals can have a different impact on the uncertainty itself (Souza, Zabot, & Caetano, 2019).…”