Is there a way to check number of books sold?
I got curious how many copies a certain book (released year and a half ago) has sold. I googled here and there and didn't find any information.
I find that somewhat strange - if I do a comparison with the movie industry, where financial results determine whether the movie is great or a flop.
So is there any source for what a book has earned so far (or at least copies sold)?
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