Supply Chain Diversification Masked Upstream Reliance
Manufacturers shifting final assembly to Mexico often remain dependent on Chinese components for production.
Updated on Oct. 14, 2026 in Manufacturing
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While China's direct share of U.S. imports has declined since 2017, manufacturers have frequently transitioned to assembly hubs in countries like Mexico that still rely on upstream Chinese parts. This reality complicates efforts to fully localize supply chains, which experts estimate takes roughly a decade to achieve.
Why it matters
Companies are reconfiguring operations to hedge against geopolitical risk and trade policy uncertainty, but the persistence of Chinese intermediate goods means exposure remains high. Operators must distinguish between simple relocation of final assembly and true diversification of their supplier base.
The transition to localizing supply chains, such as moving operations to Mexico, requires approximately 10 years to fully implement. This shift occurs as China’s direct share of U.S. imports has declined since 2017, even as manufacturers continue to leverage Chinese components.
The players
Willy Shih
Professor of management practice in business administration at Harvard Business School with 28 years of industry experience.
Port of Los Angeles
A primary gateway for U.S. international trade that recently reported record cargo volumes.
The details
Companies are increasingly rearranging final assembly steps to gain flexibility while maintaining deep ties to established Chinese supplier networks. Manufacturers moving into regions like Mexico or Vietnam often rely on imported intermediate goods from China rather than building new local supply ecosystems from scratch. This strategy provides regional proximity to the U.S. market but keeps businesses exposed to the same geopolitical risks they initially sought to avoid.
Timeline
Since 2017, China's direct share of U.S. imports has trended downward.
On October 9, 2026, Willy Shih discussed global supply chain interconnectedness at a virtual media briefing.
Market Landscape
The current movement toward Mexico marks a strategic departure from fully Chinese-based manufacturing, yet it follows a pattern of extended transition periods observed in global industrial shifts. This trend updates the understanding of regionalization by showing that final assembly relocation is often just the initial phase of a multi-year supply chain decoupling.
Operators should audit their procurement tiers to determine if suppliers in new assembly regions are merely passing through components from their original Chinese sources. Focusing on long-term supplier development rather than just geographic relocation is essential to reducing genuine operational risk.
The takeaway
True supply chain localization is a decade-long capital and logistical project rather than a quick assembly move. Operators should track the origin of intermediate components in their bills of materials to understand their actual exposure to geopolitical trade volatility.
Further reading
For more on the complexities of regional industrial strategies, visit Manufacturing.
Source note: This article includes information reported by Chinadaily.
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