Cases · Tools
Cut a supplier
Pick a stage of one of the ten chains and an exporter, and cut its exports: who loses what share of their supply, who could fill the gap, and what passes one stage down the chain. First-round arithmetic on 2024 trade shares, not a forecast.
- 89stages to choose from
- 2024the year of the shares
- 25exporters of this stage listed
Aluminium · S2 · Alumina
Cut the exports of Australia in Alumina (Aluminium, stage 2) and follow the shortfall to the importers and one stage down the chain.
Who loses what share of their supply: Alumina, 2024
- World exports cut34.8%
- Importers with over a quarter at risk11
| Importer | At risk, share of its imports | Its other suppliers would ship |
|---|---|---|
| 100% | none | |
| 99.6% | +25,125% | |
| 98.4% | +6,100% | |
| 98.4% | +6,016% | |
| 96.4% | +2,672% | |
| 80.7% | +418% | |
| 80% | +399% | |
| 71.8% | +255% | |
| 50.6% | +102% | |
| 28.4% | +40% | |
| 25.5% | +34% | |
| 24.6% | +33% |
* Did not file this period: its imports are seen through its partners’ reports.
Who could fill the gap: New Zealand, 100% of its imports
It buys from no other supplier in the table: nothing fills the gap in the first round.
The largest other exporters, by share of world exports
- Brazil 18.8%
- Indonesia 10.4%
- China 7.2%
- Ireland 4.2%
- Jamaica 3.7%
One stage down the chain
Unwrought aluminium
Upper bound (100% pass-through, no use share). This stage feeds only this chain, so the chain file gives it no use share and the whole shortfall passes down.
26.7% of world unwrought aluminium exports at risk in the first round, summed over the 14 large exporters with an exposure upstream. The 8 listed below carry 23.6%.
| Exporter | Its exposure upstream | World exports at risk |
|---|---|---|
| UAE | 80% | 7.8% |
| Bahrain | 96.4% | 4.3% |
| Canada | 23.9% | 2.7% |
| South Africa | 98.4% | 2.7% |
| Qatar | 80.7% | 1.7% |
| India | 25.5% | 1.6% |
| Mozambique | 98.4% | 1.5% |
| Malaysia | 21.2% | 1.2% |
An exporter of the next stage loses its share of world exports × its own exposure upstream (× the use share). Exporters on a closed route lose their own exports × the cut. Exposure upstream is the share of its imported alumina that came from the closed supplier, not of all the alumina it uses: where most are made at home (Japan, Korea, Germany for car parts), it overstates the risk.
First-round arithmetic on trade shares, not a forecast: an importer’s exposure is its import share from the shocked suppliers × the cut. No stocks, no new suppliers, no price changes.
Suppliers are read from the flows the map stores for the stage: each importer’s ten largest suppliers and every flow above 0.05% of world trade; the rest are “smaller suppliers”. The next stage and the use share come from the chain file.