Japan's Yield Curve Control: Lessons for the West
The Bank of Japan's grand experiment is ending — and the world should pay attention
Japan did not defeat deflation. Deflation simply became too expensive to maintain.
For seven years, the Bank of Japan committed to an extraordinary proposition: it would cap the yield on ten-year government bonds at a level of its choosing, purchasing as many bonds as necessary to enforce the target. It was the most ambitious experiment in monetary history. Its unraveling offers lessons that Western central bankers would be wise to study.
The logic of yield curve control was internally consistent. By capping long-term rates, the BOJ sought to steepen the yield curve, support bank profitability, and stimulate borrowing. In practice, the policy worked — until it didn’t.
Japan did not defeat deflation. Deflation simply became too expensive to maintain.
The Exit Problem
The fundamental challenge of yield curve control is that it creates its own constituency. Banks, insurers, and pension funds restructure their portfolios around the policy. When the central bank moves to exit, it risks destabilizing the very institutions it sought to support.
Western Implications
The Federal Reserve briefly considered yield curve control during the pandemic and ultimately declined. The Japanese experience validates that caution — but also raises uncomfortable questions about what happens when conventional tools prove insufficient.