A thriving society would benefit everyone, even on a small scale like in a corporation. So companies should be built an run with this in mind, by giving company ownership to employees or giving bonuses based on the success of the whole organization.

Mentoring also has direct benefits for the Mentor. Like he is able to consolidate his knowledge in the subject he teaches. He provably has more authorithy about the project and generally how things are done. He might receive recognition in the form of higher pay.