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The constraint that makes South Korean equities behave like an AI proxy runs through the memory supply chain.
High-bandwidth memory, the component that sets the ceiling on how fast AI accelerators can move data between compute cores and storage, is produced at scale by a small number of manufacturers.
Two of the largest are South Korean: SK Hynix and Samsung. That upstream position means the country's stock market registers shifts in AI investment sentiment with unusual directness.
This week it registered a sharp positive one.
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