Using a novel methodology, we offer new evidence that a threshold relationship exists for Okun's law. We use a logistic smoothed transition regression (LSTR) model where possible threshold endogeneity is addressed based on copula theory. We also suggest a new test of the linearity hypothesis...

This paper applies the panel unit root test proposed by Im, Pesaran and Shin (1997) to test for unemployment hysteresis in the US states and the EU countries against the alternative of a natural rate. The results show that hysteresis for the EU and the natural rate for the US states are the most...