Things were going so well. But Japan's stock market has posted some frightening falls in recent sessions. Investors, take heart: there's at least one index that's still on the way up. Meet Mizuho Securities' "tuna-mackerel" index. Its creator, economist Kenta Ishizu, hit upon the unusual idea of using fish to predict future economic trends. In the birthplace of sushi, that makes a lot of sense.moreless
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