said by KrK:
Ever heard of barriers to entry?
The biggest problem with the Laissez-faire market theory is that it always assumes that at any time anyone can enter business and increase the supply of choices and competition. Since that isn't true, the rest of it also fails.
Sprint-Nextel-Clear, TMobile, MetroPCS, Leap, Cricket, and to some extent, America Movil prove that those "barriers" are surmountable.