Rare-earth magnets are everywhere now—powering electric vehicles, spinning inside wind turbines, enabling MRI imaging, and guiding precision systems. The catch? Supply concentration is real. Chinese manufacturers have locked down market dominance in rare-earth magnet production, controlling a massive chunk of global output. This matters more than you'd think. As EV adoption accelerates and renewable energy infrastructure expands worldwide, the bottleneck around rare-earth supply keeps tightening. It's a fascinating case study in how commodity control shapes entire industries.