“everybody is ignorant, but just about different things”

The fact that we don’t know how to do other people’s jobs as well as they do illustrates libertarian, or classic liberal, ethics, fairly well. We also do not know how to live other people’s personal lives as well as they do, and have no right to attempt to do either. The only valid judge of the value of any worker’s labor is the employer. Likewise, for other activities, there is far less justification for expecting any justification than many people presume.

http://jewishworldreview.com/cols/sowell012307.php3