If it is true that...

Startups thrive in startup hubs like Silicon Valley because they understand the specialized business of startups

Then it must be true that...

All other things being equal, the more of a startup hub a place is, the better startups will do there

If it is true that...

Startup hubs are also markets and markets are usually centralized

and

Face to face contact makes deals happen and it hasn't yet been duplicated by technology

Then it must be true that...

All other things being equal, the more of a startup hub a place is, the better startups will do there

If it is true that...

Startups would do better if they moved to Silicon Valley

and

All other things being equal, the more of a startup hub a place is, the better startups will do there

Then it must be true that...

The difference between cities is a matter of degree