What Makes The Yen A Safe-haven Currency?(1)

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In the 2008 financial crisis, the yen rose 20%. In the 2010 European debt crisis, the yen rose 10% against the euro. In 2011, the Japanese earthquake also caused the yen to appreciate. The yen can be compared with the Swiss franc and the U.S. dollar, becoming one of the three major international safe-haven currencies, what is the reason for it?