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"But the staggering number of reviews involved for most of these books (over a hundred on average across our entire sample) makes each of these highly unlikely. "
I'm guessing that someone has not seen the websites and discussion sites where authors (and their 'helpers') swap reviews in bulk or the sites that openly advertise the sale of bulk reviews. "Me and my dozen users will review you, and you and your dozen can review me", "Pay me and I will add twenty reviews to your book". Sometimes it is more obvious than at other times but it certainly happens on Goodreads where there is considerable enforcement against it happening. Amazon is not going to be immune to it.
Apart from that, I loved the article.
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