Carlos Slim $47.8 billion -$4.5 billion
Mark Zuckerberg $47.0 billion +$1.2 billion
Zuckerberg is now one of only three billionaires among the 20 richest people on Earth to see an increase this year, according to the Bloomberg index, a daily ranking of the world’s 400 richest people. The billionaires had a combined net worth of $3.7 trillion as of Jan. 27, a 14 percent decline from their peak of $4.3 trillion on May 18, 2015.