13 countries that have only one billionaire

Net worth: $2.2 billion

Percentage of country's GDP: ~2.0%

Source of wealth: Investments

Dos Santos is the oldest daughter of Angola's former president, Jose Eduardo dos Santos, who left office in 2017. According to Forbes, Dos Santos acquired stakes in Angolan companies like banks and a telecom firm during her father's presidency.

Net worth: $4.9 billion

Percentage of country's GDP: ~30.2%

Source of wealth: Investments

Ivanishvili amassed his fortune in Russia in the metals and banking industries before moving back to Georgia in 2013. He served as Georgia's prime minister for 13 months in 2012 and 2013.

Net worth $2.2 billion

Percentage of country's GDP: ~ 8.5%

Source of wealth: Investments

Björgólfur Thor Björgólfsson began to amass his fortune in the Russian beer industry, cofounding Bravo brewery and creating the Botchkarov beer brand.

He has investments in Polish and Chilean telecom companies, cryptocurrencies, and startups including Zwift, BeamUp, and Deliveroo. Björgólfsson went almost completely broke during the 2008 recession when he had to pay off more than $1 billion in debt.

Net worth: $1.4 billion

Percentage of country's GDP: ~0.9%

Source of wealth: Diversified

Alghanim is the chairman of Alghanim Industries, a conglomerate founded by his father in the 1930s. The company sells General Motors and Ford cars in Kuwait and owns other businesses, including Wendy's restaurants in the Middle East.

Net worth: $3 billion

Percentage of country's GDP: ~48.2%

Source of wealth: Dental products

Zeller is the former CEO and now a supervising board member of Ivoclar Vivadent AG, a Lichtenstein-based dental products company with offices in 25 countries. Zeller's grandfather, Dr. Adolph Schneider, bought the company in 1948. Zeller served as CEO from 1990 to 2003.

Net worth: $1.7 billion

Percentage of country's GDP: ~5.9%

Source of wealth: Diversified

Chaudhary holds a controlling stake in CG Corp Global, which makes the popular Wai Wai noodles, owns 30 hotels, and manages 55 more.

His two sons help him run the company.

Net worth: $4.9 billion

Percentage of country's GDP: ~2.0%

Source of wealth: Energy, investments

Amorim was married to Americo Amorim. After he died in 2017, she and her three daughters inherited his fortune, which was made in the family's cork business, Corticeira Amorim, as well as international investments in energy and banks.

She has an estimated 18% stake in Galp Energia, a Portuguese oil and gas company.

Net worth: $1.2 billion

Percentage of country's GDP: ~0.6%

Source of wealth: Hotels, diversified

Al Thani is the founder and chairman of Al Faisal Holding, one of Qatar's largest conglomerates, which owns more than 20 hotels worldwide, including the St. Regis in Washington, DC and Miami, and the W Hotel in London.

His company also holds a majority stake in Aamal, which sells medical supplies and pharmaceuticals and owns real estate in Qatar.

Net worth: $1.1 billion

Percentage of country's GDP: ~0.4%

Source of wealth: Banking, insurance

Tiriac has a minority stake in Romanian insurance company Allianz-Tiriac and has also made investments in automobile dealerships, petroleum, and real estate.

Net worth: $5.3 billion

Percentage of country's GDP: ~112%

Source of wealth: Retail, real estate

Kirsh owns 70% of Jetro Holdings, a wholesale supplier of goods to small stores and restaurants.

He's also invested in commercial property development.

Net worth: $1.9 billion

Percentage of country's GDP: ~3.3%

Source of wealth: Diversified

Dewji is the CEO of METL, a Tanzanian conglomerate that deals in textile manufacturing, flour milling, beverages, and edible oils in at least six African countries. His father founded the company in the 1970s.

Dewji signed the Giving Pledge in 2016, promising to give at least half his wealth to charity.

In October 2018, he was reportedly kidnapped at gunpoint and held for nine days.

Net worth: $2.8 billion

Percentage of country's GDP: ~9.0%

Source of wealth: Telecom

Masiyiwa is the founder and 50% owner of mobile network Econet Wireless Zimbabwe.

He also owns more than half of Liquid Telecom, a private company that supplies fiber optic and satellite services to telecom companies throughout Africa.