How did the person with the most wealth you know get rich?

Among the people I know, how did the person with the most assets get rich? Among the people I know are relatives of my family, and their family fortune is relatively large. At that time, in the early days of reform and opening up, we sold a number of bicycles, and within a few years we had an income of 200,000 yuan. At that time, there were very few households worth 10,000 yuan, and more than 200,000 yuan was already a large amount. Later he opened a supermarket, but at that time there were only shops in the whole city. He was one step ahead of others and made a lot of money. In this way, we develop step by step with a unique vision. Assets now exceed 100 million.