I am not telling. But here are some median professor salaries, by discipline, courtesy of Newmark's Door.
The columns probably won't line up. They are:
Discipline . . . Full prof . . . Assoc Prof . . . Asst Prof . . . New Asst Prof . . . Instructor
Biological and Biomedical Sciences . . .86,612 $62,677 $52,510 $52,275 $41,103
Business, Management, Marketing, and Related Support Services $98,384 $82,347 $75,835 $81,842 $51,939
Communication, Journalism and Related Programs $77,307 $59,549 $50,027 $48,637 $41,230
...
English Language and Literature/Letters $74,040 $57,598 $47,724 $47,357 $37,573
English Language and Literature/Letters: General $73,693 $56,868 $47,405 $47,006 $37,612
Family and Consumer Sciences/Human Sciences $78,255 $61,948 $51,238 $50,869 $40,320
...
Social Sciences $81,501 $63,008 $52,826 $52,619 $42,019
Social Sciences: Political Science & Government $79,648 $61,247 $50,207 $50,207 $41,591
Social Sciences: Sociology $78,061 $59,919 $49,935 $49,142 $39,817
Theology and Religious Vocations $66,706 $55,518 $47,310 $45,665 $39,732
The universities do a good job of extracting rent from those who have low opportunity costs (i.e. are not, on average, much good for anything else?). No wonder others are jealous of the salaries earned in law, biz, and economics.
Phil Miller has his usual insightful comments about opportunity costs and professors' salaries here.
Scoop suggests contrasting economists' salaries with the salaries of those who declare a double major in theology and the arts.
Does anyone know why newly hired assistant profs in many fields are paid more than "assistant professors"? Surely that type of salary inversion cannot be good for morale or for retention of good faculty members.