Unter veränderten weltpolitischen und weltwirtschaftlichen Konstellationen stellt sich die Frage, ob Entwicklungszusammenarbeit in ihrer jetzigen Form noch zeitgemäß ist. Sind ihre Ziele, Strukturen und Instrumente noch angemessen? Wie muss sie auf neue globale Herausforderungen reagieren,...

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...

Mixed-data sampling (MIDAS) regressions allow to estimate dynamic equations that explain a low-frequency variable by high-frequency variables and their lags. To account for temporal instabilities in this relationship, this paper discusses an extension to MIDAS with time-varying parameters, which...

The slow recovery following the 2008/2009 recession has led to renewed interest in the question whether deep recessions lower real GDP permanently or whether we can expect a rebound to earlier trend levels. Using a recent quantile autoregression unit root test we check whether shocks to real GDP...