The idea that parity is an integral facet of the National Football League is one that many of the league’s followers often discuss. Roughly speaking, the idea of parity is not that all teams are created equal, but rather the differences between them are less rather than more, that 0-0 at the beginning of September means the field is wide open.

In practical terms, parity is often taken to mean that a) anything can happen on “any given Sunday,” and b) there will always be at least one team that ...

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