TSCHERNIG, Rolf; ZIMMERMANN, Klaus F. - Institut de Recherche Économique et Sociale (IRES), … - 1992
able to generate fragile equilibria. For instance, the natural unemployment rate is al- lowed to shift over time depending … on past unemployment. Actually, many European unemployment series seem to exhibit a unit root or persistence. This view … is questioned in the paper using German data on unemployment. A new class of time-series models, the fractionally …