In the following video, Motley Fool analysts Morgan Housel and Matt Koppenheffer discuss the recent purchase of the New York Stock Exchange (NYX.DL) by IntercontinentalExchange (ICE -0.37%). They tell us how the mass move toward electronic trading and shrinking profit margins in the stock trading business mean mergers here are a necessity, and how investors shouldn't count their chickens on this particular merger just yet, until it passes regulatory review.