Gates, Bezos, Yankovich, Buffet all have a theorhetical fortune. I assume none of them have a Scrooge McDuck like vault of coins on a hill somewhere. So how do they convert their wealth into purchases. One would assume they have some walking around money. But if they want to buy a speed boat or a pallette of rice-a-roni, do they have to sell stock? How do you convert equity worth billions into everday cash?