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by slg 4636 days ago
Maybe a better analogy is the promotion and relegation system popular in European football[1]. The teams are all divided up into separate tiered leagues, but through success a team from a lower division can move up to the higher tiered leagues. Likewise a top tier team needs to keep a certain baseline of success to prevent themselves from being sent down to a lower league.

[1] - http://en.wikipedia.org/wiki/Promotion_and_relegation