What if the US hikes Vietnam's transshipment tariff to 60%?
Doubling Vietnam's transshipment rate to 60% guts the China-plus-one workaround, so apparel/electronics importers (Nike, on-shore assemblers) eat margin and CNY weakens as rerouting fails. Rhymes with the 2018-19 trade war when supply chains fled to Vietnam; reversing that escape valve re-concentrates tariff incidence on China, pressuring the yuan back toward prior 7.3+ stress. Vietnam is now a top-5 US import source; the forward angle is that there is no third hub left to absorb the diversion, so cost pass-through is stickier than in 2019.
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The butterfly cascade
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What it would mean
If this plays out, it is a risk-off shock. US lifts Vietnam's transshipment tariff from 40% to 60%, alleging Chinese rerouting and gutting the China-plus-one hub. The trigger decomposes into signed root‑shocks — China growth ▼ · Trade tension ▲ — which propagate through our causal graph to the markets below.