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Heavyweight boxer Joe Louis was the world’s longest-reigning heavyweight champion. The span of his run lasted 12 years from 1937 to 1949. As one could imagine, your net worth will rise if you continue to be the best in your field. His gross income in his best days totaled $4.6 million.
When he died, Louis was in debt. Tax problems, bad investments, and overall bad financial choices knocked out his bank account. Perhaps a better agent could have assisted him in these areas.