I am not an expert but I think the success depends on how much money they can leverage from the stock market. Otherwise they have to borrow money with interest etc which probably costs them more. In my opinion, survival and success of a company depends on a solid stock price. That's why only companies favored by Wall Street grow. Think of Google. If Wall Street didn't pour money to Google, they would never be where they are today. Of course this brings the question of how wall street pick companies and if wall street favor companies owned by their brethtren (ethnic origin).