Tschernig, Rolf J.V.; Zimmermann, Klaus F - C.E.P.R. Discussion Papers - 1992
persistence. This view is questioned in the paper using German data on unemployment. A new class of time-series models, the … able to generate fragile equilibria. For instance, in this literature the natural unemployment rate is allowed to shift … over time depending on past unemployment. Actually, many European unemployment series seem to exhibit a unit root or …