Read MoreLast week the Indian firm owned by Asia’s richest man had more than $50bn wiped off its market value.Last week the Indian firm owned by Asia’s richest man had more than $50bn wiped off its market value.

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Read MoreLast week the Indian firm owned by Asia’s richest man had more than $50bn wiped off its market value.Last week the Indian firm owned by Asia’s richest man had more than $50bn wiped off its market value.