Despite their ability to spend, spend, spend, even some of the richest people in the world stick to a few frugal habits. For a few billionaires, that means opting out of Michelin-starred restaurants in favor of an American classic: McDonald's.
Facebook CEO Mark Zuckerberg was spotted eating a grab-and-go McDonald's meal on the Mignanelli Steps near Piazza Spagna in Rome during his honeymoon with his new wife Priscilla Chan in 2012.
Legendary investor Warren Buffett loves the Golden Arches as well. He visits the restaurant every day for breakfast and never spends more than $3.17.
On his five-minute drive to the office, which he's been doing for the past 54 years, Buffett stops by McDonald's and orders one of three items.