Since 1986 | Forbes Magazine | The World's Billionaires is a ranking of the world's richest billionaires by net worth, which is compiled and published annually in March by the American business magazine Forbes. The list was first published in March 1987. The total net worth of each person on the list is estimated and expressed in US dollars. Kings and dictators whose wealth derives from their positions are excluded from these lists. This ranking is an index of the wealthiest individuals, excluding billionaires whose wealth cannot be fully ascertained. Link: Forbes.