“…But also other asset class prices – like commodity, housing and energy prices – might contain explosive roots due to speculation (or even bubbles) (see, for example, Shi and Arora, ; Figuerola‐Ferretti et al ., ; Engsted et al ., ). Furthermore, explosiveness in macroeconomic variables like Debt/GDP ratios (see, for example, Yoon, ), inflation (see, for example, Casella, ) and government bond yield spreads (see Wegener et al ., ) indicates economically relevant interpretations like, for example, unsustainable debt policies, hyperinflation or sovereign debt crises. Explosive behaviour in economic and financial variables is typically a temporary rather than a permanent feature.…”