If I like the book I'm going to pay what I think is a reasonable amount for that particular book. I.e. about $10 for a regular new release ebook. So if I'm interested about the brain and exercise I'm going to get the book no matter how long and short it is, and the cost doesn't have to do with the length because I'm going to buy it either way.
Now if it's just something I'm slightly interested in and I'm on the fence about buying it, I'll cave over more quickly if it's 500 pages vs. 200 pages.
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