https://hbr.org/2017/12/the-rise-fall-and-rebirth-of-the-u-s-antitrust-movement

This is an article on the history of antitrust policy in America. It is a very interesting introduction to the nature of antitrust and contains examples of how we think about the competition (and why we like it) as economists. The example of Standard Oil is a great example of how firms can get large enough to begin to impede competition. The article describes a shift in focus of antitrust. What was this shift? What do you think should be the focus of antitrust now? Can you see any potential "Standard Oil" cases in the world around us?