Ingvar Kamprad, IKEA, Sweden

Net worth: $23 billion

If you thought Warren Buffet was 'Thrifty', you haven't met Ingvar Kamprad yet. The IKEA founder is on the opposite end of the scale that Larry Ellison and Eike Batista occupy, driving around his native Sweden in a Volvo 240 GL. And yes, he still takes the bus.