Number of ultra-rich swells to almost 173,000
The world gained an extra 5,300 UHNWIs last year and, as with other people worth $30m or more, they like property and luxury items in a big way
Rare stamps and coins
The world gained an extra 5,300 UHNWIs last year and, as with other people worth $30m or more, they like property and luxury items in a big way