In this paper the seasonal unit root test of Hylleberg et al. (1990) is generalized to cover a heterogenous panel. The procedure follows the work of Im, Pesaran and Shin (2002). Test statistics are proposed and critical values are obtained by simulations. Moreover, the properties of the tests...

Are specific developments in stock prices in line with fundamentals or do they reflect a rising bubble? And if the latter result applies, how is it possible to detect a bubble in real time? The answer to this question is of utmost relevance for a number of areas, not least for either financial...

The relationship between inflation and real GDP growth is one of the most widely researched topics in macroeconomics. At the same time, it is certainly not exaggerated to claim that this nexus also stands at the heart of monetary policy, given the fact that low inflation in combination with high...