Except when it does. Many/most startups experience the trough of sorrow ( http://andrewchen.co/2012/09/10/after-the-techcrunch-bump-life-in-the-trough-of-sorro

Except when it does. Many/most startups experience the trough of sorrow ( http://andrewchen.co/2012/09/10/after-the-techcrunch-bump-life-in-the-trough-of-sorrow/ http://andrewchen.co/2012/09/10/after-the-techcrunch-bump-li... ). Hard to know when to throw up the white flag... But the ones that win certainly refused to do so when all/most of their data showed them that they should. tl;dr irrational (at the time) perseverance is a necessary but not sufficient trait for startup success.