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It's all a matter of signal to noise ratio.

> Perception is different than reality. I genuinely wonder if these are "the best", or if these employees were merely the ones willing to move their lives to a new city for a high paying job.

You can always find that one diamond in the rough. It's true there's a selection bias toward folks that are willing to relocate. But I bet the average engineers at Google is much better than at Generic Company Co.