“…However, some recent trends of time series research run counter to this view. See, for example, Perron (1989Perron ( , 1994Perron ( , 1997, Raj (1992), Raj and Slottje (1994), Ben-David andPapell (1995), andDolmas et al (1999). These authors examine the historical data set of real GDP, productivity, income inequality, and other such variables for various developed countries and find that they are characterized not by the presence of a unit root but by stationary fluctuations around a breaking deterministic trend.…”