Bloomberg actually did a decent writeup on this.[1] [1] http://www.bloomberg.com/news/articles/2014-03-03/advertisings-century-of-flat-line-growth http://www.b

Bloomberg actually did a decent writeup on this.[1] [1] http://www.bloomberg.com/news/articles/2014-03-03/advertisings-century-of-flat-line-growth http://www.bloomberg.com/news/articles/2014-03-03/advertisin...