Regional Diffusion
A second layer on top of each global→Korea echo: did Korea’s close East-Asian peers (Japan, Taiwan, Singapore, China) also echo the same global instrument, and when? This reconstructs the actual transmission path — a directed arrow with lead/lag — rather than treating Korea as an isolated recipient.
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Echo patterns are similarity-based hypotheses, not proof of causation. Open the sources and evaluate the linkage yourself.
Korea leads
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Korea is the regional first-mover; the arrow points outward.
Relay
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The norm relays through a peer (often Japan) before reaching Korea.
Parallel
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Korea and peers adopt independently from a common trigger.
Mixed
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No single line — different peers lead on different fronts.