Mark Cuban has built billion-dollar businesses, but his first venture was a flop. At 24, he tried selling powdered milk, only to abandon the idea after a month when customers showed no interest. The failure taught him one of his core business principles: it only takes one success to change everything. Cuban later founded MicroSolutions, selling it for $6 million, and then launched which Yahoo acquired for $6 billion. Today, he’s worth an estimated $6 billion. Speaking on the “Aspire” podcast, he said that starting a business with no money often means starting a service-based company. He suggests combining something you do well with a real market need. That could be anything from tutoring or graphic design to dog walking or social media management. The key, he says, is to use sweat equity when you lack financial capital. Cuban also sees huge opportunity in artificial intelligence, saying that if he were starting today without money, AI would be his focus. His message to entrepreneurs is clear: persistence and adaptability matter more than avoiding failure, and one well-timed idea can make all the difference.