APACにおける「分散投資」はもはや何も軽減しないのか？

I think the correlation argument holds water; we've seen increasingly synchronized movements. However, I wonder if the magnitude of the moves still differs enough across these markets to offer some diversification benefit, even if the direction is often the same.

I've noticed that too. While long-term macroeconomic divergence still exists, the increasing interconnectedness of global capital markets means short-term correlations can be surprisingly high across what were once considered distinct regions. It makes you wonder if the traditional diversification playbook needs a refresh, at least for day-to-day volatility.