That's according to a report from the Hamagin Research Institute, released this week.
Gangsters account for one-fifth Tax evasion is the biggest problem.
Many people think that Japan is a clean country and that common people do not engage in such underground economic activity. Japan's gangsters account for a fifth of the underground activity. There are an estimated 80,000 yakuza gangsters in Japan. They have captured the public imagination in Japan, where they are feared but also a generally accepted part of society. Overseas, they are best known for their distinctive tattoos and often-missing fingertips, cut off in a show of loyalty.