The 2010 season was, according to the popular actual-to-idealized standard deviation ratio, the second-most balanced NFL season since 2002, and it is the same story if one instead uses other popular measures, such as Gini coefficients or Herfindahl indexes. This result is favorable to those that believe in the invariance principle – that arguably, this is some (albeit very limited) evidence that the salary cap was not previously contributing much towards making the NFL so balanced.
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