An entrepreneur who spent 5 years interviewing 21 self-made billionaires asked every single one how they made their first million dollars - here's what they said

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Many of the world's richest billionaires built their wealth from scratch.

Rafael Badziag, an entrepreneur and expert in the psychology of entrepreneurship, spent five years conducting face-to-face interviews with 21 self-made billionaire entrepreneurs around the world (defined as those with a net worth of at least $1 billion) and researching their lives and companies.

In his book "The Billion Dollar Secret: 20 Principles of Billionaire Wealth and Success," he shared how each of those billionaires made their first $1 million. Some earned it through the businesses they founded, while others earned it through investments or by working for someone else's company.

For the purposes of this slideshow, unless otherwise specified, we assumed that any of Badziag's subjects whose net worth we were not able to verify with Forbes' net worth listings is worth at least $1 billion. All information on the billionaires comes from Badziag's book.

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Mohed Altrad made his first million in the scaffolding business.

Mohed Altrad made his first million in the scaffolding business.

Net worth: $2.6 billion

Altrad is the founder and chairman of Altrad Group, which offers services and equipment for the construction industry in more than 100 companies and is a world leader in scaffolding. Altrad owns the Montpellier Hérault Rugby Club and has written three novels.

Tony Tan Caktiong made his first million in the food service business.

Tony Tan Caktiong made his first million in the food service business.

Net worth: $3.6 billion

Caktiong is the founder and chairman of Jollibee Foods, Asia's largest food service company. It operates 13 restaurant chains and has more than 4,300 restaurant outlets in 18 countries worldwide.

Jack Cowin made his first million with fried chicken.

Jack Cowin made his first million with fried chicken.

Net worth: $1.6 billion

Cowin is the owner, chairman, and managing director of Competitive Foods Australia, one of the country's largest food processors. It's also the country's largest franchisers of restaurants, introducing fast food to Australia with KFC, Burger King, and Domino's Pizza.

Cai Dongqing made his first million by selling little toy trumpets.

Cai Dongqing made his first million by selling little toy trumpets.

Net worth: $1.6 billion

Dongqing is the founder and chairman of Alpha Group, an animation corporation in China. It also has operations in movies, operas, theme parks, and other interactive activities ranging from entertainment to consumer projects. Dongqing has been called the "Walt Disney of China."

Tim Draper made his first million with a venture capital investment in Parametric.

Tim Draper made his first million with a venture capital investment in Parametric.

Net worth: Unknown

Draper is a Silicon Valley venture capitalist. He's considered to be one of the most connected investors in Silicon Valley and is credited as the inventor of viral marketing, according to Badziag. Draper founded VC firms Draper Fisher Jurvetson and Draper Associates.

Sergey Galitsky made his first million through the distribution business.

Sergey Galitsky made his first million through the distribution business.

Net worth: $3.4 billion

Galitsky is the founder and CEO of Magnit, Russia's largest food retailer and non-state employer. It has more than 17,000 convenience stores, cosmetic stores, hypermarkets, and supermarkets.

Peter Hargreaves made his first million with financial services.

Peter Hargreaves made his first million with financial services.

Net worth: $3.9 billion

Hargreaves is an industry leader in the UK's financial services sector. His business, Hargreaves Lansdown, manages assets up to $120 billion.

Frank Hasenfratz made his first million through defense work.

Frank Hasenfratz made his first million through defense work.

Net worth: $1 billion

Hasenfratz is the founder and chairman of Linamar, which specializes in the production of automotive powertrain systems and wind turbines. It's considered "one of the most innovative, tech-savvy, and profitable enterprises in the industry," Badziag wrote.

Naveen Jain made his first million working for Bill Gates.

Naveen Jain made his first million working for Bill Gates.

Net worth: Unknown

Jain has a hefty resume: He's the founder of Infospace (now Blucora), which provides Internet-related services; Intelius, a public records business; TalentWise, which helps employers complete background checks; Moon Express, which develops commercial lunar landers; Bluedot, a tech company that provides location data; and Viome, a biotech company. He is vice chairman of Singularity University and trustee of the XPrize Foundation.

Kim Beom-Su made his first million through computer games.

Kim Beom-Su made his first million through computer games.

Net worth: $2.6 billion

Beom-Su is the founder and chairman of South Korean internet company Kakao. Kakao operates mobile messenger KakaoTalk, which is used by 95% of Korean smartphone owners; search engine Daum; and music streaming service Melon.

N.R. Narayana Murthy made his first million with software.

N.R. Narayana Murthy made his first million with software.

Net worth: $2.4 billion

Murthy is the cofounder and CEO of software giant Infosys, the first Indian company to be listed on NASDAQ. Infosys has minted six other billionaires and more than 4,000 millionaires. Murthy has been hailed as one of the 12 greatest entrepreneurs of our time by Fortune magazine.

Hüsnü Özyegin made his first million working as a bank president for 13 years.

Hüsnü Özyegin made his first million working as a bank president for 13 years.

Net worth: $1.9 billion

özyegin has created 75 companies in 12 countries. He's also the founder of özyegin University in Istanbul. He founded Finansbank and then branched out his business activities to finance, retail, real estate, energy, health, and hotels.

Lirio Albino Parisotto made his first million with electronic retail.

Lirio Albino Parisotto made his first million with electronic retail.

Net worth: $1.4 billion

Parisotto is the largest investor in the Brazilian stock market. He founded Videolar, an early manufacturer of audio and videotapes, floppy disks, CDs, DVDs, and Blu-rays. Now, it's a petrochemical company and major manufacturer of plastic materials in Brazil.

Dilip Shanghvi made his first million with psychiatric medicines.

Dilip Shanghvi made his first million with psychiatric medicines.

Net worth: $7 billion

Shanghvi is the founder and managing director of Sun Pharmaceuticals, India's largest drug maker. He's the world's wealthiest person in the pharmaceutical industry.

Ron Sim made his first million by selling household products.

Ron Sim made his first million by selling household products.

Net worth: $1.4 billion

Sim is the founder, chairman, and CEO of OSIM International, which makes high-end massage chairs. He's also a stakeholder in Singapore and China malls and owner of TWG Tee, Brookstone, Richlife, and GNC.

Michal Solowow made his first million in construction.

Michal Solowow made his first million in construction.

Net worth: $3.2 billion

Solowow has started and sold several companies in the construction, real-estate development, retail, and production sectors. His main assets are in the floorboards, ceramics and tiles, and chemical industries. He also invests in tech and startups.

Petter Stordalen made his first million with a "project in Trondheim to connect three shopping centers into one, where nobody believed, and I believed, and the bonus was one million."

Petter Stordalen made his first million with a "project in Trondheim to connect three shopping centers into one, where nobody believed, and I believed, and the bonus was one million."

Net worth: $1.4 billion

Stordalen has been dubbed the "King of Hotels." He's behind the Nordic Choice Hotels chain, which has nearly 200 hotels. His corporate group, Strawberry, operates in real estate, finance, hotels, and the arts.

Frank Stronach made his first million by selling automobile companies.

Frank Stronach made his first million by selling automobile companies.

Net worth: $1.5 billion

Stronach is the founder of Magna International, one of the world's biggest auto parts suppliers. He founded Stronach Group, America's leading racetrack owner and operator. He's also one of the world's most successful horse breeders and owners.

Manny Stul made his first million wholesaling innovative giftware.

Manny Stul made his first million wholesaling innovative giftware.

Net worth: $1.3 billion

Stul is the chairman of global toy manufacturer of Moose Toys, one of the fastest growing companies in the industry. It's received more than 40 awards worldwide.

Chip Wilson made his first million with sports apparel.

Chip Wilson made his first million with sports apparel.

Net worth: $4.1 billion

Chip Wilson is the founder and former CEO of Lululemon Athletica. He's also the founder of Westbeach, which specializes in surf, skate, and snowboarding clothes, and is involved with Kit and Ace, which specializes in technical casual wear.

Cho Tak Wong (Cao Dewang) made his first million through the production of water meter glass.

Cho Tak Wong (Cao Dewang) made his first million through the production of water meter glass.

Net worth: $2.1 billion

Dewang is the founder and chairman of Fuyao Group, the world's largest manufacturer of automotive glass. He's a heavy philanthropist and the most respected entrepreneur in China, according to Badziag.

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