article_snippet: Next is investor Warren Buffett, who moved up one slot this year with a net worth of $72.7 billion.
article_snippet: The average net worth of those on the list was $3.86 billion.
article_snippet: Mark Zuckerberg, 30 - Facebook ($33.4bn)
article_snippet: Dustin Moskovitz, 30 - Facebook ($7.9bn)
article_snippet: Bill Gates - Microsoft, $79.2 bn .
article_snippet: Warren Buffet - investor, $72.7 billion .
article_snippet: Larry Ellison - Oracle, $54.3 billion .
article_snippet: Charles Koch - various, $42.9 billion .
article_snippet: David Koch - various, $42.9 billion .
article_snippet: Christy Walton -  Walmart, $41.7 billion .
article_snippet: Jim Walton - Walmart, $40.6 billion .
article_snippet: Jim Walton - Walmart, $40.6 billion .
article_snippet: Jim Walton - Walmart, $40.6 billion .
article_snippet: Bernard Arnault - LVMH, $37.2 billion .
article_snippet: Michael Bloomberg - Bloomberg, $35.5bn .
article_snippet: Jeff Bezos - Amazon, $34.8 billion .
article_snippet: Mark Zuckerberg -Facebook,  $33.4 billion .
article_snippet: Li Ka-shing - various, $33.3 billion .
article_snippet: Sheldon Adelson - casinos, $31.4 billion .
article_snippet: Larry Page - Google, $29.7 billion .
article_snippet: Larry Page - Google, $29.7 billion .
article_snippet: Christy Walton, 60, $41.7 billion, Walmart .
article_snippet: Alice Walton, 65, $38.6bn, Walmart .
article_snippet: Laurene Powell Jobs, 51, $19.5bn, Apple .