That why i usually keep to the insurance example, i agree that comparing municipality power to private companies owning a monopoly is unfair.

Administrative costs for insurance are very easy to verify, and the facts stay consistent across countries. If i cherry picked something, it is the admin overhead for US insurers. US health care insurers are particulary effective with their average of 14% admin overhead, SwissLife, that used to be my private insurer, had a year with 30%, which make the comparison quite unfair).