Real exchange rates are quite persistent. Standard unit root tests are not very powerful in drawing a conclusion regarding the validity of purchasing power parity [PPP]. Rather than asking if PPP holds throughout the whole sample period, we examine if PPP holds sometimes by employing...

Various unit roots tests are suggested over the years. However, many of them suffer severe size problems as well as low power. Recently, Ng and Perron (Econometrica, 69, 1519-1554, 2001) propose new modelling strategy that yields good power and reliable size. This letter applies their testing...

Possibly hitherto unnoticed cointegrating relationships among integrated components of data series are identified. If the components are cointegrated, the data are said to ahve hidden cointegration. The implication of hidden cointegration on modeling data series themselves is discussed...

In this study, I provide corrections to the estimation results reported by Balassa (1963) on testing the implications of the Ricardian model of international trade. While all of his estimation results have changed, his main conclusions still pertain. I conjecture that the errors are most likely...

In this study, we show that a very simple structural break process can be easily confused with an Exponential Smooth Transition Autoregressive (ESTAR) model. Nonlinear estimates of an ESTAR model also appear to be quite significant and plausible when the model is applied to a structural break...

A variable is defined to be self-generating if it can be forecast efficiently from its own past only. Conditions are derived for certain linear combinations to be self-generating in error correction models. Interestingly, there are only two candidates for self-generation in an error correction...

This note shows that a very simple model can generate returns that resemble most of the temporal and distributional behavior of long returns surprisingly well. The model is based on the stochastic unit root process introduced in Granger and Swanson (1997).