Here's your Forbes Daily Briefing for Saturday, July 13th.

Today on Forbes, The One Reason Warren Buffett isn't the world's richest person.

Warren Buffett shocked the world in 2006 when he pledged to give away nearly all of his vast fortune.

Since then, Buffett has donated more than $55 billion worth of his Berkshire Hathaway to charity, including a $5.3 billion gift

in late June this year that knocked him down two spots on Forbes' list of the world's

richest people, from 8th to 10th,

his lowest ranking in more than two decades.

Forbes estimates his net worth to be $128.9 billion.

But what if Buffett, who was 93 years old and perhaps the greatest

philanthropist in history, had instead decided to keep all his Berkshire shares for

himself? Buffett owned 474,998 Class A shares,

then worth around $43 billion,

when he made that historic announcement

in the summer of 2006.

If he still owned all that stock today,

he'd be sitting on a pile of stock worth $292 billion.

Add in another $1 billion or so worth of Class B shares and personal investments,

and a less charitable Buffett would have a fortune of around $293 billion.

That would make him some 41 billion dollars richer than the

planet's current number one, Elon Musk, whose net worth is $252.4 billion.

77 billion dollars ahead of number two, Jeff Bezos, who's worth $215.9 billion, and $102 billion above

number three Bernard Arno, who's worth 191 billion.

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