Billionaire investor Warren Buffett believes Japan's devastating earthquake is the kind of extraordinary event that creates a buying opportunity for shares in Japanese companies, Reuters reported. The 80-year-old investor noted that he’s seen it happen in the United States and around the world and doesn’t think Japan will be an exception. "It will take some time to rebuild, but it will not change the economic future of Japan," Buffett said on Monday in South Korea. "If I owned Japanese stocks, I would certainly not be selling."