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Ask HN: How do you identify what is a small initial market?

I have heard a lot about going after a small initial market and try and get a few dedicated users to love your product before expanding out. My question is what are some good tips for identifying a small initial market? What's too big? Should it be geographical?
( 1 comment | 2 points | on HN )
Re:Ask HN: How do you identify what is a small initial market? by brudgers on Friday December 11, 2015 @09:35AM (#10717265)
In the context of startups, my understanding is that it's not enough to identify a small initial market (e.g. Julius Caesar impersonators), ideally it should have some reasonable potential to be huge in the future.