Buffett and global investors flock to undervalued Japan.

Billionaire investors including Warren Buffett, Ken Griffin, and Steve Cohen are turning to Japan for investment opportunities, citing the country's relatively cheap prices compared to other markets around the world. Hedge funds and private equity firms are opening offices in Tokyo, with Citadel reopening an office it had closed after the global financial crisis and Point72 Asset Management planning to expand its staff in Japan this year.