There is much debate, but surprisingly little evidence, concerning the impact of primarily supply side Welfare to Work programmes in labour markets characterised by weak labour demand. The usual argument is that we might expect Welfare to Work measures to have greater impacts in tight labour...

We show how to obtain the exact power envelope of tests for a unit root against trend-stationary alternatives, under normality. This is in contrast to the asymptotic power envelope derived by Elliott, Rothenberg and Stock (1996), and is used to indicate the lack of power of unit root tests in...