While I agree with your opinion of the submitted list, I feel your list is a bit unbalanced. Why only math, science and economics?

A few random suggestions:

Meditations by Marcus Aurelius

http://classics.mit.edu/Antoninus/meditations.html

How to Read a Book by Mortimer J. Adler and Charles Van Doren

http://www.amazon.com/How-Read-Book-Touchstone-book/dp/06712...

Building a Bridge to the 18th Century by Neil Postman

http://www.amazon.com/Building-Bridge-18th-Century-Improve/d...