This paper examines the effect of X-11 seasonal adjustment on periodic autoregressive processes, using both analytic techniques and simulation. Analytical results show that adjustment reduces (but does not eliminate) periodicity in the coefficients of a stationary PAR(1) process, and it...

This paper examines the implications of applying the Hylleberg, Engle, Granger, and Yoo (1990, <italic>Journal of Econometrics</italic> 44, 215–238) (HEGY) seasonal root tests to a process that is periodically integrated. As an important special case, the random walk process is also considered, where the...

This paper explores the relationship between inequality and growth in the context of a unified empirical approach suggested by the theoretical model of Galor and Moav (2004). Based on the model’s prediction, we construct a measure of human capital-to-physical capital ratio in order to...

This paper develops an open-economy intertemporal growth model with We provide evidence on the sources of co-movement in monthly US and UK stock returns by investigating the role of macroeconomic and financial variables in a model with time-varying correlations. Cross-country communality in...

Empirical studies often find that the spread between longer and shorter rates does not have predictive power for future longer rates, violating the Expectations Theory (ET). Although the predictive power of the spread for future shorter rates is largely in accordance with the ET, especially when...

We investigate changes in international business cycle affiliations using an iterative procedure for detecting system-wide structural breaks. We analyze GDP growth rates in two systems, one with the US, Euro-area, UK and Canada and the other for the Euro-area countries of France, Germany and...