Mike Masnick included a fascinating chart in this story:
What it shows is that while new books are available for sale, they quickly go out of print and are basically not available — until you get down to 1923, at which point the works are in the public domain. Think of all those works that are no longer available to buy in that major gap in the middle. Heald has since updated that research to show how serious a problem this is — and demonstrating how the arguments against letting these works into the public domain make no sense. He demolishes the arguments made by some that a public domain will be either “under” or “over” exploited (yes, both arguments are made), as neither makes much sense.
It appears that copyright is doing similar damage in Europe. At the latest Chaos Communications Congress in Germany, Julia Reda, the European Parliament member from the Pirate Party gave a talk on the state of copyright law today (you can see the video here and included a similar graphic concerning books available in Europe:
