If they have so much pricing power, why are their returns less than SP500? Who would want to lose money compared to a risk-less investment where you don’t have to do any work?
If so then antitrust laws kick in from three different companies colluding on this.
However, I'm skeptical of much pricing control. Few other markets have such widely distributed market share. There is some stickiness in that people don't want to move often, but unless there's a major shortage (which would be the true cause of high prices), it's hard for a 5% owner to exert much on the market.