“What’s the difference between a philosopher and an engineer?”/“About $50,000 a year.”

A joke about the earnings potential of philosophers is:
 
Q: What’s the difference between a philosopher and an engineer?
A: About $50,000 a year.
 
The joke was posted on the newsgroup alt.philosophy on May 29, 2004.
 
         
Google Groups: alt.philosophy
Philosophy Humor
ta
5/29/04
(...)
What’s the difference between a philosopher and an engineer?
About 50,000 a year.
 
Twitter
HansjoergNiederegger‏
@HansjoergN
What’s the difference between a philosopher and an engineer?About 50,000 a year.
5:31 PM - 20 Dec 2009
   
Twitter
James Church‏
@jcchurch
Replying to @jmstitt
@jmstitt Q: What’s the difference between a philosopher and an engineer? A: About $80,000 per year.
9:39 AM - 2 Mar 2010
     
Google Books
Ultimate Book of Jokes:
The Essential Collection of More Than 1,500 Jokes
By Scott McNeely
San Francisco, CA: Chronicle Books
2011
Pg. 87:
Q : What’s the difference between a philosopher and an engineer?
A: About $100,000 a year
 
Twitter
Colin Graham‏
@ColinTGraham
What’s the difference between a philosopher and an engineer? About 20,000 a year. #jokenight
4:40 PM - 11 May 2011
   
Google Books
The Hourglass
By Sharon Struth
Warwick, RI: Etopia Press
2013
Pg. ?:
“What’s the difference between a philosopher and an engineer?”
“About eighty thousand per year.”
 
Twitter
snoot 🥀‏
@milksneaks
“What’s the difference between a philosopher and an engineer?
About $100,000 a year.”
Thanks Mr. Abney.
3:20 PM - 30 Sep 2014
 
Reddit—Jokes
What’s the difference between a philosopher and an engineer?
submitted January 2, 2018 by CaveRaider17
$90,000