Interesting read from Reed Hastings on "Netflix Culture". It's somewhat similar to "A players hire other A players, B players hire C players", but pertaining to employee retention.
The Keeper Test Managers Use:
Which of my people, if they told me they were leaving, for a similar job at a peer company, would I fight hard to keep at Netflix? The other people should get a generous severance now, so we can open a slot to try to find a star for that role. (page 25)