An earlier generation of American CEOs had to scramble to survive, but it’s harder than ever to build something from nothing.

MARK ZUCKERBERG

On Friday, the legendary investor, 87, was surpassed in wealth by 34-year-old Mark Zuckerberg. The gap was closed in part by Facebook’s surging stock—up 15 percent this year so far—and in part by Buffett’s large charitable cash outflows. Today, the three richest people in the world, Jeff Bezos, Bill Gates and Zuckerberg, have all made their fortunes in tech.
Compared to Buffett and many of his contemporaries, Zuckerberg’s childhood was more banal. He grew up in Dobbs Ferry, a small middle-class suburb of New York, the son of a dentist and a psychiatrist. He started using his father’s computer at a young age, and showed an early facility for programming, before graduating from an elite prep school.
Zuckerberg’s story is typical of the slate of newly minted technology billionaires in the ranks of the Bloomberg Billionaires Index. And there are a lot of them. With 64 technology businessmen and women on Bloomberg's list, which tracks the world’s 500 richest people, the industry has produced more billionaires than any other (unless you count inheritances—there’s a lot of inherited wealth on the list, too). This year alone, tech has created 11 new billionaires.But there's something missing from the foundational stories of this new group of self-made men (yes, they’re mostly men). Where earlier generations' formative experiences revolved around paper routes and pathos, today's prototypical founding story involves an upper-middle-class childhood, early access to a computer, and an elite education—even if that education was abandoned. Before he famously walked out of Harvard University, Zuckerberg created an instant messaging system for his dad's dental practice at age 12. At 15, Twitter's Jack Dorsey was dazzling his bosses during a programming internship. And Uber's Travis Kalanick was writing code by middle school.

2 WARREN BUFFETT

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Early in Warren Buffett’s life, his father failed to get hired at the family grocery store during the Great Depression. Without a job, and without any money after a run on the banks, the family of four ran up a tab of grocery bills at the store to put food on the table, and even then, his mother sometimes skipped meals. Leila Buffett, beset by stress and with a mind likely impacted by linotype fumes she inhaled as a child, would often berate her two small children.
From this nadir, the family gradually achieved more secure financial footing. His father started a stock brokerage and eventually went on to become a four-term congressman. Young Warren started showing an aptitude for numbers. He became obsessed with timing everything, calculating odds, even tallying the frequency of the letters that appeared in the bible most frequently, according to The Snowball: Warren Buffett and the Business of Life. By age 15 he managed to earn thousands working his local paper route. The rest, as they say, is history.

3 JACK DORSEY

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The self-made man has always played a profound role in the American imagination. Horatio Alger wrote stories of plucky, lower-class strivers who made their way in the world by dint of honesty and hard work. Hollywood has fetishized the underdog since movies were invented. And for years, the business world offered real stories too.

But the modern rise of the Harvard dropout (or New York University in Dorsey's case, or UCLA in Kalanick's case), complicates that story. Today's founders are long on brilliance, but short on hardship. It's difficult, after all, to become a computer prodigy without a computer. That dollop of privilege speaks to a larger trend in the American economy: For millions of low-income people, it's getting harder to build something from nothing. In order to drop out of Harvard, first you have to get in.

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Buffett, with a father who was a politician and investor, often jokes that despite the family’s temporary bout with poverty, he won the “ovarian lottery.” He would eventually attend Columbia Business School and study with renowned investor Benjamin Graham. But for many leaders of Buffett’s generation, dorm rooms weren’t a part of the origin story. Consider Bruton Smith, who until he stepped down as CEO of Speedway Motorsports Inc. in 2015 at age 88, was one of the oldest serving public company leaders. Smith grew up on a farm, never went to college, and once took a shotgun to a construction site to settle a labor dispute. Oil baron Harold Hamm, born in 1945 as the youngest of 13 children of Oklahoma sharecroppers, drilled his first oil well at age 25 (it eventually paid for college). And then there's recently deceased casino and movie magnate Kirk Kerkorian, born in 1917, who faked documentation of a high school graduation in order to join the military as a pilot.

Early in Warren Buffett’s life, his father failed to get hired at the family grocery store during the Great Depression. Without a job, and without any money after a run on the banks, the family of four ran up a tab of grocery bills at the store to put food on the table, and even then, his mother sometimes skipped meals. Leila Buffett, beset by stress and with a mind likely impacted by linotype fumes she inhaled as a child, would often berate her two small children.From this nadir, the family gradually achieved more secure financial footing. His father started a stock brokerage and eventually went on to become a four-term congressman. Young Warren started showing an aptitude for numbers. He became obsessed with timing everything, calculating odds, even tallying the frequency of the letters that appeared in the bible most frequently, according to The Snowball: Warren Buffett and the Business of Life. By age 15 he managed to earn thousands working his local paper route. The rest, as they say, is history.

In some ways, it's great to live in the age of the nerd. And it’s tough to mourn the decline of Wall Street-style corporate machismo. But a poor kid growing up today may find it much harder to emulate the life path of someone like Zuckerberg, who coded an instant messaging system before hitting puberty, than that of even Goldman Sachs CEO Lloyd Blankfein, who grew up in Brooklyn housing projects and at one point served concessions at Yankee Stadium to earn extra money.

Statistically as well as anecdotally, true American rags-to-riches stories are getting rarer. Class mobility, as defined by the percentage of children who earn more than their parents, has been in a state of mostly uninterrupted decline since the 1940s. Economist Raj Chetty found that only about half of the children born in 1980 have surpassed their parents’ income. In 1940, that number exceeded 90 percent.
Of course, most successful entrepreneurs have earnings that vastly outstrip their parents’. In fact, they outstrip the earnings of nearly every human in history. In by-now-familiar statistics, the rate of income growth at the top levels of earning in the U.S. have far outpaced growth at the bottom segments (in the 1980s, it was the other way around, according to research by Thomas Piketty, Emmanuel Saez and Gabriel Zucman). Last year Oxfam International found that more than 80 percent of earnings went to the top 1 percent of the world population.

That so many of today’s new billionaires mostly come comfortable backgrounds is emblematic of a broader concentrating of wealth in the U.S. According to recent Federal Reserve data, the median family's net worth had not recovered its pre-recession value by 2016, while the top 10 percent gained double digits since 2007.

Of course, you can still find evidence of rough patches and plenty of hard work in the early childhoods of today's wealthiest tech luminaries. Elon Musk, 47, an immigrant from South Africa, came from wealth, but was bullied as a kid before moving to Canada alone at just 17, where he enrolled in Queens University and transferred to the University of Pennsylvania, before eventually dropping out of a Stanford University PhD program. Jeff Bezos, 54, was born when his mother was 16 years old, and was adopted by her second husband, a Cuban immigrant and an engineer. And Sergey Brin, 44, came to the U.S. as a six-year-old, when his parents traded the anti-Semitic backdrop of Moscow academia for a new life in the U.S.