The Cost of Decoupling: What US-China Economic Fragmentation Really Costs the World

Decoupling was once a fringe idea; today it is explicit US and increasingly Chinese industrial policy. Washington has layered Section 301 tariffs from the first trade war era with more targeted export controls on advanced semiconductors, chipmaking equipment, and AI-related technology, framed explicitly as national security measures rather than pure trade policy. Beijing has responded with its own restrictions on rare earth and critical mineral exports — inputs the West depends on for everything from electric vehicle batteries to fighter jets — and has accelerated its own domestic substitution programme for foreign technology.

The economic logic driving this is only partly about efficiency anymore. For much of the post-Cold War era, companies built ‘just-in-time’ supply chains optimised purely for cost: a single factory in a single country supplying the world. The pandemic exposed how fragile that model is, and geopolitical risk — sharpened further by the Iran conflict and Strait of Hormuz disruptions rattling energy and shipping routes in 2026 — has pushed firms toward ‘just-in-case’ redundancy: multiple suppliers, geographically diversified, even if that means paying more.

The World Economic Forum's modelling puts numbers on both the gradual and severe versions of this shift. In a full fragmentation scenario, growth could fall by as much as 6.4 percentage points in the worst-affected economies, with inflation rising by up to 6.1 percentage points — effects concentrated in economies most exposed to either US or Chinese supply chains, with limited ability to diversify. Even the milder, current trajectory is not free: an estimated $213-307 billion has already been shaved off global GDP, alongside a modest but persistent inflationary drag.

Not every economy loses. ‘Friend-shoring’ — the relocation of manufacturing to politically aligned or neutral third countries — has been a clear net positive for Vietnam, India, and Mexico, all of which have captured meaningful shares of electronics assembly, textiles, and light manufacturing that once went to China. India's Production Linked Incentive (PLI) schemes and ‘China+1’ positioning are a direct beneficiary of this reallocation. Mexico's exports to the US have surged partly on genuine nearshoring and partly on Chinese firms using Mexican assembly to bypass tariffs altogether — a form of trans-shipment that complicates any simple ‘decoupling is working’ narrative.

That complication matters. Aggregate US-China bilateral trade has indeed fallen from its peak, but China's total exports have kept rising, increasingly routed through third countries. Some economists argue this means measured decoupling overstates true separation: the two economies remain deeply intertwined, just with more intermediaries and higher transaction costs layered in. Others counter that even this rerouting represents genuine economic cost — the extra shipping, tariff-avoidance structuring, and duplicated infrastructure are exactly the kind of friction the WEF estimates are trying to capture.

For 2026, the IMF's April World Economic Outlook cut China's growth forecast to 4.4%, citing trade fragmentation alongside the drag from Middle East conflict on global energy markets — a reminder that decoupling costs do not stay contained to the two countries directly involved. In an integrated global economy, fragmentation anywhere raises costs everywhere, even for bystander economies with no direct stake in the US-China relationship.