According to Felix Oberholzer (Harvard Business School) and Koleman Strumpf (UNC-CH), music downloads don't affect CD album sales. (Link is to 369K .pdf file.)

And this article claims that CD album sales in Australia are doing just fine.

UPDATE: But this paper, by a new Chicago Ph.D., suggests that piracy does have a statistically and economically significant effect on CD sales.

Looks like another battle of instruments. I'll need some time to try to sort the issues out.

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