Ernest Sirolli in un TED Talk:

The smallest company, the biggest company, has to be capable of doing three things beautifully: the product that you want to sell has to be fantastic; you have to have fantastic marketing; and you have to have tremendous financial management. Guess what? We have never met a single human being in the world who can make it, sell it and look after the money. It doesn’t exist. This person has never been born. We’ve done the research, and we have looked at the 100 iconic companies of the world Carnegie, Westinghouse, Edison, Ford, all the new companies, Google, Yahoo. There’s only one thing that all the successful companies in the world have in common, only one: none were started by one person.