MERCATOR · METHODOLOGY
A structural model of supplier substitution estimated on 30 years of bilateral product-level trade (CEPII BACI, 270M flows), validated out-of-sample on the 2022 Russia shock as a quasi-experiment.
TradeWeave’s shock tools answer what is exposed when a supplier is cut off. Mercator answers the harder question: where would the trade actually go?We identify 389,308 historical supplier-displacement episodes (an incumbent supplier’s import share of a product collapses while total demand holds), estimate which alternative captures the displaced share, and test the model strictly out-of-sample on the supplier the world was forced to replace in 2022: Russia.
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Conditional logit (McFadden) coefficients, standardized. Magnitude is the story; with hundreds of thousands of episodes every term is statistically distinguishable.
Applying the model to every current single-source dependency (36,450 across 198 importers) yields a new primitive: the effective number of viable alternative suppliersif the incumbent is removed. Low values mean structurally locked-in. The index is economically sharp: jute yarn, bleached wood pulp, and ferro-niobium score near 1–2 (geographically concentrated, near-irreplaceable), while generic manufactures score 30+. Dependency concentration is overwhelmingly a small/landlocked developing-economy phenomenon, not a rich-economy one.