Amazon is one of the stocks best positioned to benefit from artificial intelligence and robotics. Only eight companies listed on U.S. stock exchanges currently have a market value above $1 trillion. They are listed as follows, in descending order. Beside each is the median target price set by Wall Street, and the implied upside compared with the share price as of Aug. 4. Most Wall Street analysts think Amazon is the best trillion-dollar stock to buy right now. Here's what investors should know. 1. Nvidia is ...