The wealth held by the world's top 20 billionaires - about $3.8 trillion - is greater than the GDP of most countries on Earth, according to visualcapitalist.com, which notes that these fortunes have grown at an astonishing pace since 2020. At the time, Jeff Bezos, the American entrepreneur who founded the online retail company Amazon.com, was the richest person in the world, with a net worth of $145 billion. Today, Tesla CEO Elon Musk's fortune is almost five times that figure. • Musk - the