This company is a mainstay in its field and has minimal competition. One wrench that is getting thrown in the mix is self-driving vehicle technology. Start-ups such as Waymo -- backed by technology giant Alphabet -- are rapidly expanding across the United States with an improved customer value proposition. Is this a threat to Uber's monopoly? Despite the recent market drawdown, many growth stocks still look overvalued at the moment. The S&P 500 price-to-earnings (P/E) ratio is 29, which is close to a record ...