1990 Japanese Bubble Collapse

The Japanese bubble of the late 1980s was the largest asset price bubble in modern history. At the 1989 peak, the Nikkei 225 traded at a P/E ratio above 60. Tokyo real estate was valued at roughly four times all US real estate combined. The Imperial Palace grounds were said to be worth more than all of California. Japanese banks held the top five spots globally by market cap. The mechanics were classic post-intervention monetary policy. After the 1985 Plaza Accord forced the yen to 50% stronger, the BOJ cut rates from 5% to 2.5% to offset the export drag. Credit expansion, especially for land collateral, exploded. Corporate zaitech (financial engineering) turned companies into leveraged equity funds. Household savings flowed into Nippon Life and other insurers, which invested aggressively in real estate and equities. By 1989, gross leverage in the system was extreme. The unwinding was violent and sustained. On December 29, 1989, the Nikkei closed at 38,957. By October 1990, it had fallen to 20,221, a 48% drop in ten months. But the real damage was the grinding, multi-decade bear market that followed. Not until October 2024, 35 years after the peak, did the Nikkei surpass 38,957. Real estate fell 70% or more from peak. The major banks required repeated recapitalizations. Zombie corporations, technically insolvent but kept alive by evergreened loans, became a structural feature. Japan's response defined "Japanification" as a macro regime. The BOJ cut rates to zero by 1999, the first major central bank to do so. Quantitative easing, helicopter money proposals, yield curve control, negative interest rates, Japan pioneered every tool the Fed and ECB would later deploy. Fiscal deficits pushed government debt to 250% of GDP. Yet deflation persisted, real GDP growth averaged under 1% for three decades, and the working-age population began a structural decline. The durable lesson is that post-bubble balance sheet recessions last for generations, not cycles, and demographic decline compounds the drag.