Twitter owner and Tesla boss Elon Musk has been knocked off the top of the Forbes billionaire list after a $US4.7 billion ($6.86 billion) drop in his net worth, according to Forbes.
Bernard Arnault, the chief executive of luxury brand Louis Vuitton's parent company LVMH, and his family now claim the title as the world's richest with Forbes plotting a personal wealth of $US188.6 billion.
