"Sustainable growth is characterized by one simple rule: New customers come from the actions of past customers."
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Source : Eric Ries (2011). “The Lean Startup: How Today's Entrepreneurs Use Continuous Innovation to Create Radically Successful Businesses”, p.207, Crown Business
Source : "Laughing at something is a form of accepting it, or at least making peace with it". Interview with Chris Cobb, logger.believermag.com. September 19, 2014.