Tit for Tat

Have you ever struggle to explain an idea and not succeed only to find out that there's already a name for your idea and Wikipedia(!) can explain it better :(

http://en.wikipedia.org/wiki/Tit_for_Tat

And I've been trying to explain the whole good might not win in the short term but it wins in the long term thing... now I'll just say but it works in Game Theory