The conventional thinking is that a big total available market (TAM) is one of the most important factors in startup success. But Julia Hartz's success at Eventbrite shows the limits of this thinking. In this Lesson of Greatness, Mike Maples Jr of Floodgate talks about the difference between available markets and potential markets and offers heuristics for determining the potential market for future breakthroughs.Check out the new Pattern Breakers Blog at patternbreakers.substack.com for even more Pattern Breaking content from Mike.   Mike's new book Pattern Breakers is available now wherever you buy books.