Kyoei Life promised bubble-era returns in a zero-rate world — ¥4.5T in liabilities

Kyoei Life Insurance was founded in 1935, and in the 1980s and 1990s it sold long-term policies promising the returns Japan's bubble economy made ordinary. When the bubble broke, the central bank cut rates toward zero, and those guarantees became a negative spread — 逆ザヤ — the company paying out more than its assets could earn, every year, on policies with no expiry date.

For a decade Kyoei survived on the hope that rates would recover. They did not. The stock and property crash kept eroding the capital meant to absorb the gap, and on 20 October 2000 — less than two weeks after Chiyoda Mutual Life, a larger rival, went under with ¥2.9 trillion in liabilities — Kyoei filed for special liquidation with ¥4.53 trillion in debts. It was, at that moment, the largest single corporate failure in Japan's postwar history.

The month itself set the record: 1,711 Japanese companies failed in October 2000 with a combined ¥8.6 trillion ($79.6B) in liabilities, thirteen times the year before. Kyoei's policies were taken over by Gibraltar Life Insurance under Prudential Financial's sponsorship. The lesson the sector drew was structural: a life insurer's guarantees are only as sound as the lowest interest rate the economy can reach — and stay at.