Meet the millionaires living the ‘underconsumption’ life: They drive secondhand cars, batch cook, and never buy new clothes

• Fortune meets the millionaires who amassed their seven-figure fortunes through an underconsumption lifestyle, which has opened up doors for flexible working and early retirement.

Despite having billions to their name, some of the wealthiest people on the planet don’t splurge on the material items that others shoppers might be tempted by.

Berkshire Hathaway CEO Warren Buffett, for example, is famous for driving a 2014 Cadillac, which is covered in damage from a hail storm. Microsoft cofounder Bill Gates drives an electric Fiat500 gifted to him by Bono, while YouTube star MrBeast sleeps in his office and had to borrow money from his mom to pay for his wedding.

So how do the rich stay rich? Apparently, by acting like they’re not. High net worth individuals and $100,000...