We should also keep in mind that a govt monopoly does not have to pay tax like private companies do.
Grampster,
My phone bill for my land line is $27/month with approx. $13 in various taxes. Now we're left with $14 in actual service charge, so if we adjust your 1970's bill for inflation how much of a difference are we actually talking about? One more thing that we should keep in mind is that govt "services" often have a blind discount built into them. What I mean by that is that the cost of those services is subsidized through other taxes so that the consumer doesnt see the true cost, though they pay it just the same.
A good example of the is the US Postal Service; it actually costs a heck of a lot more than the 34 cents to send a letter, but you dont see that at the counter becausethe govt doles out a lot of extra money to the USPS to keep it a float. If that was not the case and you had to pay the true cost of send a letter and companies like UPS and FedEx were not legally prevented from delivering mail, you'd soon see the USPS go out of business from market competition.