It is an impressive drop but I wonder if it is all due to the price increase. People who really wanted to read the book probably bought it as soon as it was available. Which means that people who were less interested in the book might have been chased off by the $2 price increase but I think there would have been a drop in sales anyway. I am sure that there is a way to compare the drop off to past books and figure out what the real drop in sales was.
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