"I think you only need two kinds of people to create a technology hub: rich people and nerds. They’re the limiting reagents in the reaction that produces startups, because they’re the only ones present when startups get started. Everyone else will move.

Observation bears this out: within the US, towns have become startup hubs if and only if they have both rich people and nerds. Few startups happen in Miami, for example, because although it’s full of rich people, it has few nerds. It’s not the kind of place nerds like.

Whereas Pittsburgh has the opposite problem: plenty of nerds, but no rich people. The top US Computer Science departments are said to be MIT, Stanford, Berkeley, and Carnegie-Mellon. MIT yielded Route 128. Stanford and Berkeley yielded Silicon Valley. But Carnegie-Mellon? The record skips at that point. Lower down the list, the University of Washington yielded a high-tech community in Seattle, and the University of Texas at Austin yielded one in Austin. But what happened in Pittsburgh? And in Ithaca, home of Cornell, which is also high on the list?

I grew up in Pittsburgh and went to college at Cornell, so I can answer for both. The weather is terrible, particularly in winter, and there’s no interesting old city to make up for it, as there is in Boston. Rich people don’t want to live in Pittsburgh or Ithaca. So while there are plenty of hackers who could start startups, there’s no one to invest in them.”

-Paul Graham