This paper argues that typical applications of panel unit root tests should take possible nonstationarity in the volatility process of the innovations of the panel time series into account. Nonstationarity volatility arises for instance when there are structural breaks in the innovation...

This paper introduces a new measure of fiscal policy uncertainty based on the disagreement among professional forecasters. We analyze different patterns of this measure for the German economy for a sample period from November 1995 to April 2018 and also use Italian data for comparison....