Mark ZuckerbergMichael Kovac/Getty Images for Vanity FairFacebook founder Mark Zuckerberg in his signature uniform.
Frugality is a subjective term. To the average Joe it could mean eating meals at home or scouring the Internet for cheap flights. But to a billionaire it means showing up to work in a t-shirt and jeans, driving a Toyota or Volkswagen, and in some instances, foregoing the purchase of a private jet or lavish vacation home.
A handful of frugal billionaires appear on our list of the richest people on earth, and each one has his own penny-pinching habits.
From eating lunch in the office cafeteria with their employees to residing in homes worth a fraction of their wealth, these seven self-made billionaires — many who are also generous philanthropists — know the secret to keeping their net worths high.

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