In the world of stock selections, it is common to find statements such as Domino;s Pizza gets an upgrade and a buy recommendation from Goldman Sachs, with a target price of $256 and Amazon is upgraded from a hold to a buy with a target price of $1800. In terms of the rapidity and breadth with which financial markets incorporate new information, should any of us believe these recommendations are valuable; that is, will investments in these stocks lead to superior gains? Please be precise and thorough. (Note: this is not an opinion question, but one that has a definite answer.)