Supply Chain Risk Management Runs on Two Clocks

TL;DR: A geopolitical stress test asks one thing of each critical part: does the stock you hold outlast the time it takes to restore supply? In 2025 two export shocks answered that question in weeks for stock and months for recovery, so supply chain risk management should start by timing that gap, part by part.

Key takeaways:

• After China's 4 April 2025 licensing rule on seven rare earths, Ford idled its Chicago Explorer plant for a week in May because of the magnet shortage, while licence applications were meant to take 45 working days.
• Crisil estimated in June 2025 that most Indian automakers held four to six weeks of rare earth magnet inventory.
• ACEA said on 16 October 2025 that Nexperia chip stocks would last a few weeks, and that approving new suppliers would take several months.
• China's pause on its wider October 2025 rare earth controls runs to 10 November 2026, and no formal extension had been agreed by 6 October 2026.

"It's hand-to-mouth right now," Ford chief executive Jim Farley told Bloomberg TV in June 2025, weeks after his Explorer plant in Chicago stopped for want of rare earth magnets.[^1][^2] By his account, Chinese export licences were being approved one at a time. A few months later Europe's carmakers ran into the same problem with a chip that costs a few cents.

Two Shortages, Both Measured in Weeks

The two 2025 shocks started in different places and looked the same on the factory floor.

• Rare earths, April to July. On 4 April 2025 China's Ministry of Commerce required export licences for seven medium and heavy rare earths, including dysprosium and terbium, effective the same day.[^3] Applications were meant to be processed in 45 working days.[^4] By 4 June CLEPA, the European suppliers' association, reported production lines and plants shut across Europe, with roughly a quarter of hundreds of applications approved.[^5]
• Inventory, measured. Crisil put most Indian automakers at four to six weeks of magnet stock in June 2025, and ICRA expected some inventories to last only until mid-July.[^6] CLEPA warned of more outages within three to four weeks as stocks ran down.[^5]
• Nexperia, October. The Dutch government took powers over Nexperia on 30 September 2025, and China barred exports of Nexperia's China-made products on 4 October.[^7][^8] On 10 October Nexperia told customers it could no longer guarantee deliveries.[^9] It makes basic chips such as transistors and diodes that cost a few cents each.[^10]
• The gap, stated. ACEA said Nexperia stocks would generally last a few weeks, and that approving new suppliers and building up their production would take several months.[^9] Honda halted its plant in Mexico on 28 October.[^11] One industry source told Reuters that testing for an alternative source could take up to a year.[^12]

China exempted civilian exports of Nexperia chips on 9 November 2025.[^13] That did not settle it. In January 2026 some carmakers were buying wafers from Nexperia's European arm and shipping them to its Chinese unit themselves.[^14]

Time to Survive Against Time to Recover

MIT's David Simchi-Levi and colleagues built a way of measuring this with Ford, starting in 2013. Time to recover is how long it takes a supply node to return to full function after a disruption. Time to survive is how long the chain can keep matching supply with demand once that node goes down.[^15] If time to survive is shorter than time to recover, the line stops. The Ford work found the biggest risks tended to come from tiny suppliers of components costing about 10 cents.[^15] Nexperia's few-cent parts sit at exactly that price point.

What the record shows: in both 2025 cases, reported stock cover sat at roughly a few weeks to six weeks, while reported recovery ran from a 45 working day licence clock to several months or longer for requalification. What we infer: a company did not need to predict either shock to see the problem coming. One that had timed both clocks for its magnet and discrete chip lines would have known in advance that its survival window was the shorter one. What we recommend: time both clocks before choosing a scenario, because the comparison holds whichever government acts first.

Contracts can lengthen the recovery clock, so they belong in the model. Freshfields advised in July 2025 that a force majeure clause must explicitly cover export restrictions, that buyers may argue the rare earth curbs were foreseeable after China's 2023 gallium and germanium controls, and that higher prices alone rarely count.[^16] A supplier that cannot rely on its clause may still fail to ship. The buyer then has stock running down and no remedy in hand. Recovery time in the model should therefore be measured from the day a part stops arriving, not from the day a notice is served.

A Geopolitical Stress Test in Four Steps

Run it as a tabletop exercise with procurement, engineering, legal and planning, one product line per day. Geopolitical risk enters through specific parts, so the test starts with parts, not countries.

1. Pick three scenarios with dates. Use events that already have a clock. One is close: China's suspension of its October 2025 controls runs from 7 November 2025 to 10 November 2026, while the April 2025 licensing rule stays in force.¹ Add an ownership dispute like Nexperia's and a licence delay of 45 working days or more.
2. Trace each scenario through the bill of materials. For every affected part, record the tier where the exposure sits, which is often below tier one, as the tier-one mapping piece argues. Cheap parts get the same treatment as expensive ones.
3. Write two numbers per part. Time to survive: on-hand and in-transit stock, plus any buffer at the supplier you can verify. Time to recover: the longest of licence time, qualification time and capacity build at the alternative source. Use your own engineering estimate for qualification, then check it against ACEA's several months. A part with five weeks of stock and a 45 working day licence clock, about nine calendar weeks, fails by four weeks before qualification is even counted.
4. Read the contract against the gap. For each part where recovery is longer than survival, check whether the supply contract names export controls, what notice it requires, and who pays for expediting or requalification. Then decide whether to hold more stock or qualify a second source now. Redesign is the slow fallback.

The output is a short list of parts where the survival window is shorter than recovery, each with an owner and a decision date. For rare earth parts, the procurement pricing case sets out what to track before 10 November. The manufacturing sector page covers the wider sector view.

Fortius Intel note: No manufacturer controls whether China extends its pause on 10 November. The open question inside each company is how many parts have a survival window shorter than 45 working days, and whether anyone has written that number down.

Methodology: this analysis draws on MOFCOM, ACEA and CLEPA statements, the Dutch government, Nexperia, Reuters, Bloomberg, Crisil, ICRA, MIT and Freshfields, with each dated fact checked against at least two independent sources where a second source exists.

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Footnotes

1. Global Times, "China suspends implementation of certain export control measures involving rare earths, lithium batteries and other critical resources: MOFCOM," 7 November 2025, https://www.globaltimes.cn/page/202511/1347625.shtml; Pillsbury, "China Suspends Export Controls on Certain Critical Minerals and Related Items," 13 November 2025, https://pillsburylaw.com/en/news-and-insights/china-suspends-export-controls-certain-critical-minerals-related-items.html; and Tech Times, "Congress Moves to Break China Rare Earth Grip Before November Deadline," 6 October 2026, https://www.techtimes.com/articles/328654/20261006/congress-moves-break-china-rare-earth-grip-before-november-deadline.htm (all retrieved 21 October 2026). Source for: the suspension of the October 2025 controls from 7 November 2025 to 10 November 2026, the April 2025 Announcement No. 18 remaining in force, and no formal extension having been agreed as of 6 October 2026. ↩