It is the most popular business and I don't think there is any business that you will not buy or sell something. That is the major aspect and meaning of businessBuying and selling businesses can also be a big business for those who have money and the eye to see the potential in the business they are buying. Most of the angel investors are actually the people who buy business (invest in the business for a certain percentage of equity), and sell the business (their equity) once the company becomes big.