The Forbes World’s Billionaires list is a snapshot of wealth using stock  prices and exchange rates from March 11, 2022. Some people become  richer or poorer within days of publication. We list individuals rather  than multigenerational families who share fortunes, though we include  wealth belonging to a billionaire’s spouse and children if that person  is the founder of the fortune. In some cases we list siblings or couples  together if the ownership breakdown among them isn’t clear, but here an  estimated net worth of $1 billion per person is needed to make the cut.  We value a variety of assets, including private companies, real estate,  art and more. We don’t pretend to know each billionaire’s private  balance sheet (though some provide it). When documentation isn’t  supplied or available, we discount fortunes.