The post links the surge to 1990, when the Nikkei later fell more than 80% over the following 18 years.
Margin trading in Japan has reached its highest level since 1990, according to the post. It also draws a historical comparison to the market backdrop that began in 1990, when the Nikkei, Japan's main stock index, went on to plunge more than 80% over the next 18 years. The claim points to rising leverage as a market signal, but the post provides no further supporting data or context.