http://www.amazon.com/Competitive-Advantage-Creating-Sustaining-Performance/dp/0684841460 http://www.amazon.com/Competitive-Advantage-Creating-Sustain... Shoul

http://www.amazon.com/Competitive-Advantage-Creating-Sustaining-Performance/dp/0684841460 http://www.amazon.com/Competitive-Advantage-Creating-Sustain... Should I send a copy of this to 37 signals? I thought this was business 101. If you don't have a sustainable competitive advantage you will undoubtedly suffer. 37 signals doesn't have said advantage.