Quote:
Originally posted by Sunshine.
If you're gonna "adjust for inflation" you're gonna have to adjust for music and sound trends as well.
There's no telling how Taylor would have done with her sound in the past.
Practically speaking, it's impossible to compare across decades. 
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I really dunno why people make such a complicated issue of what is really just a consistent measurement of market share applied as a point of comparison/frame of reference.
There are X number of sales overall in a given year; Album A represents Y percentage of the total sales (X) for 2014, while Album B represented Z percentage of the total sales (X) for 2000.