Society's definition of value - there is no such thing. If something is valuable to you, then you can pay for it. There's no secret magic underlying economics.

Society's definition of value - there is no such thing. If something is valuable to you, then you can pay for it. There's no secret magic underlying economics. When the supply of people willing to teach is lower than the number of available teaching positions, the value of a teacher rises. Editted - forgot I wasn't on /irc/ =]