Each new pocket of attention is harder to find: maybe your product needs to steal attention from that one TV obscure show watched by just 3% of the population between 11:30 and 12:30 AM. The next displacement will fragment the attention even more. When found, each new pocket is less valuable. There is a lot more money to be made in replacing hand-washing time with washing-machine plus magazine time, than there is to be found in replacing one hour of TV with a different hour of TV.

via A Brief History of the Corporation: 1600 to 2100.