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# China's rare earth monopoly becomes physical AI's hidden bottleneck
- URL: https://adjacent.media/signals/chinas-rare-earth-monopoly-becomes-physical-ais-hidden-bottleneck/
- Published: 2026-09-01T16:10:20.000Z
- Updated: 2026-09-01T16:10:20.000Z
- Description: As humanoid robots move from labs to factories, actuators—the motors and mechanical systems that actually move things—represent 40-60% of hardware costs, and China controls 90% of rare earth magnet refining, the critical input.
- Author: Jonathan Greene
- Tags: #signal, theme-connected, hardware, supply chain, robotics

Source: [The Next Web](https://thenextweb.com/news/physical-ai-hardest-problem-magnet-not-model-crma-schaeffler?ref=adjacent.media)

As humanoid robots move from labs to factories, actuators—the motors and mechanical systems that actually move things—represent 40-60% of hardware costs, and China controls 90% of rare earth magnet refining, the critical input. This inverts the typical AI narrative: silicon and software are solvable problems, but scaling physical robots at cost requires either securing supply chains or developing alternative actuator technologies that Western manufacturers don't yet have. The geopolitical lever here isn't compute or data. It's metallurgical control over the mechanical layer that converts ML models into useful work.