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Corupt Welth Essay Preview: Corupt Welth Report this essay Yoshiaki Tsutsumi (堤義明, Tsutsumi Yoshiaki, born May 29, 1934) is a Japanese businessman. During the Japanese economic bubble in the late 1980s, Tsutsumi was the wealthiest person in the world for a brief period due to his extensive real estate investments through the Seibu Corporation, which.