Mukesh Ambani, the richest person in the world ...???

[online.education]

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This made Ambani the richest Indian, ahead of steel tycoon Lakshmi Mittal. On 29th October 2007, as a result of a strong share price rally in his group companies, Ambani was thought to have become the richest man in the world with a net worth of $63.2 billion, as reported by news media in India.

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This is a pretty big news here in India, but FYI, media outlets around here provide false data all the time. So, I'm wondering. Is he really the new world's riches person ...???