In the seventeenth and eighteenth centuries, prior to the Western impact, China was a major commercial power in Southeast Asia. In recent decades, China has begun to play a role in business networks in the context of growing Asian economic integration. The emergence of a sizeable middle class in...

In a recent paper, Taylor (2003) has shown that the seasonal unit root tests of Dickey et al. (1984) [DHF] have non-degenerate limiting distributions for series which admit unit roots at any of the zero or seasonal frequencies. In this note we go a stage further and show that the standard...