ppine peso fell as much as 0.8%, the South Korean won slid to about 1,476 per US dollar, and Indonesia’s rupiah hovered near its record weak level. Yet equities kept rising: South Korea’s Korea Composite Stock Price Index (KOSPI) jumped 4.3% to a record, led by chipmakers Samsung Electronics and SK Hynix on artificial intelligence-driven optimism.
Why should I care?
For markets: A stock rally and a weaker currency can happen together.
South Korea is a good example of why “risk on” doesn’t always move as one package. The KOSPI is dominated by a few mega-cap chip firms, so upbeat expectations for semiconductor profits can lift the index even if the won softens. At the same time, a strong dollar and higher oil raise import costs and inflation risk, which can weigh on currencies across emerging Asia. For global investors measuring returns in dollars, that equity-currency split can materially change the outcome versus what local headlines suggest.
Zooming out: Index rules can move markets as much as fundamentals.
Indonesia shows how plumbing matters. MSCI, an index provider whose benchmarks are followed by many funds, has kept restrictions on some Indonesian stocks and earlier warned the country could be downgraded to “frontier market” status, citing transparency concerns. Because benchmark-tracking money often must adjust holdings when index treatment changes, review dates can trigger large, mechanical flows. That’s why MSCI’s May review can loom over Jakarta trading even more than a single policy tweak or data print.
