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Originally Posted by Kali Yuga
2) Correlation does not necessarily prove causation. There is no particular reason to presume that "going DRM-free" was solely (or even predominantly) responsible for the increase in iTunes music sales. E.g. promotion was minor; and the number of iPods sold went from 28 million by the end of 2005, to 226 million by the end of 2008. I'm gonna guess that was one factor (among many) for an increase in song sales volume.
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Correlation does prove relationship though. Unless you believe it's just coincidence. (I'm not good enough at statistics to compute the odds on that, but I am good enough to figure the magnitude, and it's astronomical.)
So it could be that the increase in iTunes music sales was what caused them to go DRM-free. Or it could be that both factors were caused by a third. Or, it could be as claimed, that going DRM-free caused the increase in sales. Pick whichever one of those makes the most sense.