For a 25-30 year time frame AMZN will beat S&P and Walmart by several X. AMZN, GOOG are companies which will have a huge impact on how we live. I have put some money into them. They are Berkshire Hathaways of our time.
Also what happens tomorrow if you don't have to go anywhere to buy most products, but just fabricate it at home or at the local fab down the road as Neil Gershenfeld predicts.