Box Office Mojo says that average ticket price inflation from 2011 to 2012 overall is 1.4%
Adjusting HP7Part2's Opening Weekend ($169,189,427) by that amount would mean that the Adjusted For Inflation comparison between the two opening weekends would be:
Avengers: $200,300,000 (estimate)
Deathly Hallows 2: $171,558,079
So it's a little closer.
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Thank you, Eddie Guerrero.
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