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A Japan Post Co. mailman cycles on a street near one of the company's branches in Tokyo, Japan, on Wednesday, June 19, 2013. Japan Post Holdings Co., the biggest holder of the country's debt, appointed Taizo Nishimuro president today. Photographer: Kiyoshi Ota/Bloomberg via Getty Images

A Japan Post Co. mailman cycles on a street near one of the company's branches in Tokyo, Japan, on Wednesday, June 19, 2013. Japan Post Holdings Co., the biggest holder of the country's debt, appointed Taizo Nishimuro president today. Photographer: Kiyoshi Ota/Bloomberg via Getty Images