Plus Ca Change
A summary of Richard Posner's Recent comments on the Summers case.
In other universities the teacher is prohibited from receiving any honorary or fee from his pupils, and his salary constitutes the whole of the revenue which he derives from his office. His interest is, in this case, set as directly in opposition to his duty as it is possible to set it. ...
If the authority to which he is subject resides in the body corporate, the college, or university, of which he himself is a member, and which the greater part of the other members are, like himself, persons who either are or ought to be teachers, they are likely to make a common cause, to be all very indulgent to one another, and every man to consent that his neighbour may neglect his duty, provided he himself is allowed to neglect his own. In the university of Oxford, the greater part of the public professors have, for these many years, given up altogether even the pretence of teaching.
(from Adam Smith, The Wealth of Nations, Bk V Chapter 1 Part 3 Article II "Of the Expense of the Institutions for the Education of Youth")