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

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: http://camelcamelcamel.com/Joel-Software-Occasionally-Developers-Designers/product/1590593898?context=browse http://camelcamelcamel.com/Joel-Software-Occasionally-Develo... http://camelcamelcamel.com/The-Innovators-Solution-Sustaining-Successful/product/1578518520?context=browse http://camelcamelcamel.com/The-Innovators-Solution-Sustainin... http://camelcamelcamel.com/Hackers-Painters-Big-Ideas-Computer/product/1449389554?context=browse 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?