Tech moves away from the all-you-can-eat model

By Steven Pearlstein - as recently as the mid-1990s, Internet access providers charged on the basis of how much time you spent online. All that changed during the tech bubble of the 1990s, when so much money was invested to create so much excess network capacity that the incremental cost of providing a customer with another call, or another minute of Web access, came to be approximately zero....