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Ranking billionaire wealth is a cottage industry

At least six different companies now compile billionaire lists

While the lists are unanimous in crowning Bill Gates (above) the richest man in the world, their valuations for him range from US$75 billion to US$85 billion.

Forbes has marked down its estimate of net worth for Elizabeth Holmes (above), the founder of Theranos because of the company's lower value.

New York

NEVER before have we had so much information about the world's billionaires. We know their average age (63), their marital status (90 per cent are married, 6 per cent divorced), their most common alma mater (Harvard) and even their most common sign under the Chinese zodiac (the...

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