What was the name of the speculative bubble whose collapse helped trigger Japan’s early-1990s stock-market crash?

The Japanese asset price bubble was the speculative bubble whose collapse helped trigger Japan’s early-1990s stock-market crash.

During the late 1980s, Japanese share and land prices rose dramatically. Easy credit, optimistic expectations, and heavy lending helped push asset valuations to extraordinary levels. The Nikkei 225 reached its peak on December 29, 1989, at 38,915.87.

The Bank of Japan tightened monetary policy, and the bubble began to deflate. Share and property prices fell, damaging banks, companies, and households that had relied on high collateral values. The resulting period of weak growth and financial stress is often called Japan’s Lost Decades.

This episode is broader than a simple stock-market crash because it involved both equities and real estate. It is also not the same as the South Sea Bubble or the dot-com bubble, which occurred in different countries and periods.