By looking at the prices of a few fiction books in my collection over the period 2011-today I didn't see any evidence of the increasing price trend hinted at by the article.
The tech books I looked at might do, certainly a larger sample size would be interesting:
The tech books I looked at might do, certainly a larger sample size would be interesting:
http://camelcamelcamel.com/Joel-Software-Occasionally-Develo...
http://camelcamelcamel.com/The-Innovators-Solution-Sustainin...
http://camelcamelcamel.com/Hackers-Painters-Big-Ideas-Comput...
I'd like to see the results of deeper analysis. A report following an investigation. I suppose that would be investigative reporting?