Does investment income create less currency appreciation pressure than trade surpluses?
Core argument: Japan, China, South Korea and Taiwan together hold just under $30tn in gross foreign assets, a five-fold increase over the past two decades, with net foreign assets of about $10tn after liabilities to foreigners.
Japan, China, South Korea and Taiwan now hold nearly US10T net. At a 4% return, those net assets would generate roughly $600B over the past decade. The composition matters for exchange rates: exporters typically convert more of their foreign earnings into local currency to meet domestic costs, while foreign investment income is more likely to be reinvested abroad. A current-account surplus increasingly driven by investment income therefore creates less appreciation pressure than an equivalent trade surplus.

