As from September 2021, the rankings of the world's richest people can change due to fluctuations in net worth and other factors. Here's a list of some of the individuals who were among the richest at that time: 

    1. Elon Musk: CEO of Tesla and SpaceX.

    2. Jeff Bezos: Founder and former CEO of Amazon. 

    3. Bernard Arnault & family: Chairman and CEO of LVMH Moët Hennessy Louis Vuitton SE, the             world's largest luxury-goods company. 

    4. Bill Gates: Co-founder of Microsoft and philanthropist. 

    5. Mark Zuckerberg: Co-founder and CEO of Facebook (now Meta). 

    6. Warren Buffett: Chairman and CEO of Berkshire Hathaway, a multinational conglomerate holding         company. 

    7. Larry Page: Co-founder of Google. 

    8. Sergey Brin: Co-founder of Google. 

    9. Mukesh Ambani: Chairman and largest shareholder of Reliance Industries, a conglomerate in                India. 

    10. Larry Ellison: Co-founder of Oracle Corporation.

As of my last knowledge update in September 2021, here are some of the top 10 most expensive cars in the world. Please note that rankings and prices may have changed, and new models may have been introduced since then. Always check the latest sources for the most up-to-date information.

Bugatti La Voiture Noire

1. Bugatti La Voiture Noire: Priced at approximately $18.68 million, the Bugatti La Voiture Noire is a limited-edition hypercar with a quad-turbo W16 engine.

 

2. Pagani Zonda HP Barchetta: With an estimated price of around $17.5 million, the Pagani Zonda HP Barchetta is a limited-edition roadster powered by a 7.3-liter naturally aspirated V12 engine.

 

3. Pagani Huayra Imola: Priced at around $5.4 million, the Pagani Huayra Imola is a limited-edition hypercar with a 6.0-liter twin-turbo V12 engine.

 

4. Bugatti Chiron Super Sport 300+: Priced at approximately $3.9 million, the Bugatti Chiron Super Sport 300+ set a record as the first production car to surpass 300 mph.

 

5. Koenigsegg Jesko Absolut: With an estimated price of around $4 million, the Koenigsegg Jesko Absolut is known for its high-speed capabilities, powered by a 5.0-liter twin-turbocharged V8 engine.

 

6. Lamborghini Veneno Roadster: Priced at around $4.5 million, the Lamborghini Veneno Roadster is a limited-edition convertible with a 6.5-liter V12 engine.

 

7. Ferrari Pininfarina Sergio: With a limited production run and a price tag of around $3 million, the Ferrari Pininfarina Sergio is a tribute to the late Sergio Pininfarina.

 

8. Aston Martin Valkyrie: Priced at approximately $3.2 million, the Aston Martin Valkyrie is a hypercar developed in collaboration with Red Bull Racing, featuring a hybrid powertrain.

 

9. Limited Edition Bugatti Veyron by Mansory Vivere: Priced at around $3.4 million, this limited edition Bugatti Veyron features extensive modifications by Mansory, enhancing its performance and aesthetics.

 

10. Laferrari Aperta: With an estimated price of around $2.2 million, the Laferrari Aperta is a limited-edition convertible version of the Laferrari hybrid hypercar.