Supe, you don't even know what I was arguing, do you?
Power companies are a natural monopoly. The distribution systems require a huge capital investment and cannot be easily duplicated. Your house has to be hard wired to the power generation facility. Electricity is a commodity and changing which facility you get power from requires mager re-work.
Insurance and cell phones are efficient markets. (That term has nothing to do with whether the companies themselvs are efficient.
) There are many companies selling many levels of products. There are few barriers in switching from one provider to another.
To make a comparison between an efficient market and a natural monopoly is invalid. (
That was my argument.) The environments in which power companies and insurance companies/cell phone providers operate in are fundamentally different in so many ways that any sort of comparison is completely meaningless.