To understand power diffusion put this in your mind: computing and communications costs have fallen a thousandfold between 1970 and the beginning of this century. Now that's a big abstract number. But to make it more real, if the price of an automobile had fallen as rapidly as the price of computing power, you could buy a car today for five dollars. Now when the price of any technology declines that dramatically, the barriers to entry go down. Anybody can play in the game. So in 1970, if you wanted to communicate from Oxford to Johannesburg to New Delhi to Brasilia and anywhere simultaneously, you could do it. The technology was there. But to be able to do it, you had to be very rich -- a government, a multinational corporation, maybe the Catholic Church -- but you had to be pretty wealthy. Now, anybody has that capacity, which previously was restricted by price just to a few actors. If they have the price of entry into an Internet cafe -- the last time I looked, it was something like a pound an hour -- and if you have Skype, it's free. So capabilities that were once restricted are now available to everyone. And what that means