Abstract
The paper aims at estimating the natural rate of unemployment in Greece. The methodology adopted follows that of Hamilton. It is assumed that the rate of unemployment follows a stochastic process with periodic shifts in the mean and variance. The natural rate is then estimated using a Markov switching process. Empirical evidence is found that the Greek economy switches over time between two regimes: a regime in which the natural rate and the variance of the rate of unemployment are low (the 1970s); and a regime in which both the natural rate and the variance of the rate of unemployment are high (the 1960s, 1980s and 1990s).