The 25 wealthiest dynasties on the planet control $1.4 trillion
Twenty-one members of the Bloomberg Billionaires Index lost $1 billion or more as investors reacted to stepped-up tensions between the US and China
The Robin Hood Index compares the net worth of each country's wealthiest person to his/her government's spending
Warren Buffett has pledged to give almost all of his $79 billion fortune to charity