How these penny-pinchers retired in their 30s

Eschewing consumer culture, Pete Adeney, also known as Mr. Money Mustache, practices an extreme frugality that allowed him to retire at age 30. Avoiding car use, DIYing and investing in stock market index funds are among the tactics he and his fellow F.I.R.E. (Financial Independence Retire Early) devotees espouse. Paul Solman reports from Colorado in this installment of “Making Sense.”