Sam Walton put discount megastores on the map and built the largest retailer on Earth. He founded Walmart, which now has around 10,500 stores across 19 countries, and 255 million customers a week, thanks to their low prices. They also employ more than two million workers.

BBC business editor Simon Jack and journalist Zing Tsjeng explore Sam’s penchant for piloting his small plane to drop in, unannounced, on his stores around the USA, and discover why he danced the Hula on Wall Street, covered in leis and wearing a Hawaiian shirt.

In this special series, Good Bad Dead Billionaire, find out how five of the world's most famous dead billionaires made their money. These iconic pioneers who helped shape America may be long gone, but their fingerprints are all over modern industry - in business trusts, IPOs, and mass production. They did it all first, but how did they make their billions?

Good Bad Billionaire is the podcast exploring the lives of the super-rich and famous, tracking their wealth, philanthropy, business ethics and success. There are leaders who made their money in Silicon Valley, on Wall Street and in high street fashion. From iconic celebrities and CEOs to titans of technology, the podcast unravels tales of fortune, power, economics, ambition and moral responsibility, before inviting you to make up your own mind: are they good, bad or just another billionaire?