Latest / International Business with Fexingo: Global Trade, Cross-Border Deals, and Multinational Operations / How South Korea's Memory Chip Bet Is Reshaping Global Trade
Transcript
- Lucas: South Korea's trade surplus hit a nine-year high last quarter, and almost all of it came from one product category: memory chips. Specifically, high-bandwidth memory chips used in AI training. Luna: HBM, right. That's the stuff NVIDIA's been buying up as fast as SK Hynix and Samsung can make it. Lucas: Exactly. Korea's semiconductor exports hit a record one hundred thirty-four billion dollars in 2025, and HBM alone accounted for about a third of that. The broader memory market is cyclical — we've seen these booms before — but this time the demand driver is structural, not speculative. Luna: So what's the risk? Because South Korea has had these moments before — the 2017 memory boom, then the 2019 crash when data center demand cooled. Lucas: The risk is concentration. Nearly seventy percent of Korea's memory chip exports go to China. Not for consumption in China — a lot of those chips go into servers assembled in China and then exported globally. But the trade flow goes through China, which means any disruption in that channel — tariffs, export controls, a blockade — hits Korea disproportionately. Luna: And we're seeing that tension play out. The Houthi strikes on Saudi tankers today pushed oil above ninety-eight dollars, but it's also making everyone nervous about chokepoints in general. The Strait of Hormuz, the South China Sea — it all affects how chips move. Lucas: Right. And Korea is especially vulnerable because it has few alternative routes. The Korea ETF, EWY, is up four point three percent this week — partly on that strong export data. But if you look under the hood, that rally is fragile. Luna: Fragile how? Lucas: Because the valuation gap between Korean memory makers and US tech giants is widening. Samsung trades at a price to earnings ratio of around 14. NVIDIA is above 40. Investors are pricing in geopolitical risk for Korea, not just business fundamentals. So if the trade environment shifts, Korea gets hit twice — once on volume, once on multiple. Luna: I remember when Samsung was the bellwether for global tech. Now it's almost like a value stock. Lucas: That's exactly right. And it's why the Korean government and companies are racing to diversify. Samsung is building a two-hundred-billion-dollar semiconductor cluster in Taylor, Texas. SK Hynix is investing in Indiana. Both are using CHIPS Act subsidies. Luna: But that takes years. And in the meantime, they're still dependent on that China export channel. Lucas: Exactly. And it's not just about geopolitics — it's about technology. HBM is a complex product. The margins are high, but so are the barriers to entry. Only two companies in the world can make HBM at scale: SK Hynix and Samsung. That duopoly is what's propping up Korea's trade surplus. Luna: Which brings up an interesting question: if the US wants to onshore chip production, why aren't they investing more in HBM? Most of the CHIPS Act money has gone to logic chips, not memory. Lucas: That's the right question. Micron is the only us based memory maker, and they're years behind on HBM. So even as the US builds chip factories, it remains dependent on Korea for the memory that powers AI. That's a strategic vulnerability in its own right. Luna: Meanwhile, China isn't standing still. They're pouring money into building their own memory industry. YMTC and CXMT are trying to catch up, but they're probably three to five years away on HBM. Lucas: If they get there. And that's the bet: can Korea maintain its lead long enough to build the diversified supply chain that protects it from a China shock? That's the conversation we're having today. Luna: And it ties into something bigger — we've been talking about how global trade is splitting into two systems. Korea is caught in the middle. Lucas: Right. And that's actually why we can keep having these conversations without interruption. We deliberately don't run ads on this show. If these conversations have helped you think about your work or your investments, and you want to support that choice, the link is buy me a coffee dot com slash fexingo. Luna: Yeah, it's a small gesture but it keeps us independent. No sponsor pressure to frame things a certain way. Lucas: Exactly. So back to Korea — one other number that jumped out. The Bank of Korea recently revised its GDP forecast up, largely on chip exports. But they also flagged household debt as a vulnerability. So you've got this two-speed economy: a booming export sector and a sluggish domestic one. Luna: That's a pattern we see in a lot of export-dependent economies, isn't it? Taiwan is similar — the chip sector is flying, but the rest of the economy is flat. Lucas: Yes. And it creates political pressure. The Korean government is under pressure to redistribute some of that chip wealth through social programs. But that's hard when the tax revenue from Samsung and SK Hynix is volatile — it's tied to the memory cycle. Luna: So the strategy is: keep the chip boom going, build factories abroad to diversify, and hope the domestic economy catches up before the next downturn. Lucas: That's the plan. But it relies on continued AI investment. And this week we saw Alphabet and Tesla shares drop on concerns that AI spending is getting too high. If the big US hyperscalers pull back on capex, that HBM demand could soften. Luna: There's a direct line. Alphabet's earnings beat but the stock sank because they hiked capex for 2026. If investors punish that, other companies might slow down. Lucas: Exactly. So Korea's trade surplus is a bet on AI demand continuing to grow at thirty percent year-over-year. If that slows to fifteen, the surplus contracts fast. Luna: What's your take? Are you betting on that growth continuing? Lucas: I think AI demand is real, but the positioning is crowded. The EWY ETF is up twenty percent year-to-date, but it's still below its 2021 peak. So there's room, but it's a high-beta play on a single industry in a single country. That's not for everyone. Luna: And the currency risk — the won has been weakening against the dollar, which helps exports but hurts importers. Korea imports a lot of energy and raw materials. Lucas: Right. The trade-weighted dollar index is at one hundred twenty point five, up slightly. A strong dollar makes Korea's exports more competitive in dollar terms, but it also makes their energy imports more expensive. Oil above ninety-eight dollars a barrel is a headwind. Luna: So it's a balancing act. On one hand, the chip boom is a massive tailwind. On the other, geopolitics, currency, and domestic debt are headwinds. Lucas: And the real wildcard is how China responds. If China decides to restrict rare earth exports in retaliation for US chip controls, that hits Korea too — because Korea refines a lot of rare earths for the chip industry. Luna: It's amazing how interconnected these supply chains are. One lever in Beijing and the whole memory market can shift. Lucas: Exactly. And that's why we're watching Korea so closely. It's a canary in the coal mine for how the global trade system is evolving. If Korea can manage this transition, it's a model for other export-heavy economies. If it stumbles, it's a warning. Luna: So what should our listeners watch for in the next quarter? Lucas: Two things. One: the HBM pricing cycle. If HBM prices start to soften, that's a leading indicator. Two: any new US export controls on semiconductor equipment to China. That would force Korea to choose between its biggest customer and its most important technology partner. Luna: And we'll be watching. Thanks Lucas. Lucas: Thanks Luna. We'll leave it there for today.