Whatever. Seriously, you are being obstinate or you simply cannot understand simple math. I give up. You will never get it, not in a million years, not with pictures, not with charts, I would sooner get a raccoon to do calculus.
Cash cow monopolies in no way effect the competitive advantage of closely tied business concerns in your world and nothing is ever going to penetrate that world.
Your point wasn’t a competitive advantage, if it was you would of already read that I conceded that point to you because I never disagreed to you.
You said the phone company extorted money based not on a competitive advantage but an absolute monopoly. Which based on your reaction you now realized I ripped to shreds.