Today on Forbes, re-ranking the world's billionaires by wealth and altruism.

Elon Musk is the planet's richest person by far, worth $839 billion as of Forbes's annual

world's billionaires list. He also ranks among the least philanthropic billionaires.

Sure, Musk has transferred $8.5 billion of Tesla stock to his charitable foundations,

or 1% of his net worth, but nearly all of it is still sitting there idle.

Only an estimated $500 million, or 0.06% of Musk's vast fortune, has ever been dispersed to those

in need. His lack of giving raises a question. What would our billionaire's ranking look like

if the world's most generous people, such as Warren Buffett, who has donated more than half of

his Berkshire Hathaway stock so far,

and Bill Gates, who was moved alongside his ex-wife, Melinda French Gates,

more than $60 billion into the Gates Foundation,

had never donated a dollar to charity.

To find the answer, we adjusted the net worths of the planet's most generous billionaires,

assuming they kept any shares they've given away and that cash gifts were instead invested

at market rates of return.

The result?

Our true net worth ranking, which was detailed by Forbes chief content officer Randall Lane in a recent

TED Talk.

Musk, by the simple virtue of being so much richer than everyone else, still holds the number

one spot when measured by true net worth. But he loses serious ground to his more charitable

contemporaries. Gates has given away an estimated 731 million shares of Microsoft, if he had instead held

onto the stock, which has soared nearly sevenfold since the Gates Foundation launched in 2000,

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