In the middle of that post Seth talks about industries, specifically:

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Most industries innovate from both ends:

    * The outsiders go first because they have nothing to lose.
    * The winners go next because they can afford to and they want to stay winners.
    * It's the mediocre middle that sits and waits and watches.

I guess to some extent you can draw the same co-relations with startups:

1. People who believe that they have nothing to lose go first -- recent college grads, etc.

2. These would be the serial entrepreneur's

3. Everyone else