Carlos Slim Helu vs. Mark Zuckerberg

Every Sunday, Slim's father would give him a 5-peso allowance and required him to record his purchases in a ledger. Before going into business, Slim taught algebra at UNAM, a university in Mexico City.

Zuckerberg and his wife, Priscilla Chan, are spending $3 billion in an attempt to end, cure or manage all disease by the year 2100. In January 2019, Mark Zuckerberg purchased $59 million worth of waterfront property on Lake Tahoe in California.