IMF estimates 80% rare earth supply cut would shave 2.3% off Japan GDP

2026-07-27

IMF says Japan would suffer the biggest hit

The International Monetary Fund has estimated that if rare earth supply fell 80% and could not be replaced immediately, Japan's real GDP would be pushed down 2.3%, the biggest impact among major economies.

Impact spreads to auto industry

The IMF analyzed the economic impact of an 80% drop in supply for Japan, the United States, Germany, Britain, France and India. The auto industry would be forced to cut output in all of them, with the largest reduction rate at 9.0% in the United States. Japan followed in the mid-8% range, and the impact is seen as large because the share of raw material costs is higher than in other countries. Germany, where labor costs account for a relatively large share, had the smallest decline at 5.8%.

Dependence on China and export controls

By the size of the GDP hit, Japan faced the most severe impact with a 2.3% decline, reflecting the large weight of the auto industry, including parts makers. Germany, where the auto industry is also strong, fell 2.1%, while the United States and India were down around 1.5% and Britain and France recorded declines in the low 1% range.

In its latest World Economic Outlook released on the 8th, the IMF forecast GDP growth of 0.6% to 1.0% in 2026 for Japan, Germany, Britain and France. Applied mechanically, that would mean these countries would slip into negative growth if rare earth supply were to fall sharply.

China holds a high share across the supply chain, from rare earth mining and refining to the manufacture of heat-resistant magnets. China accounts for 70% of global rare earth output, and Chinese products are said to make up more than 80% of the magnet market.

China has used rare earths as a tool of economic coercion. In the spring of 2025, when the trade war with the second Trump administration escalated, it tightened export controls and has recently also been curbing shipments of rare earth magnets to Japan as ties cool. In June magnet exports compiled by Chinese research firm Tiehejinzailine, based on data from the General Administration of Customs of China, shipments to Japan fell 2% from a year earlier, while total global exports rose 77%. By country, shipments to the United States rose 38% and to Germany 36%, while exports to South Korea almost tripled.

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