China's rare-earth export quotas (2010)
China cut rare-earth export quotas, and prices for metals used in magnets and electronics jumped. The United States, Japan and the European Union challenged the limits at the World Trade Organization.
Buyers scrambled for supply outside China and stockpiled material.
The WTO ruled against China in 2014, but China kept most processing capacity and later consolidated the industry.
The episode shows how export concentration can become leverage, and why Beijing tracks which minerals it can supply at home.
