This paper examines a crucial difference between copyright and patents that requires very different analyses for each in the cases of notice effects and monopoly. In the first instance, notice costs will be shown to be much more import in the case of patents then they are in the case of...

This paper attempts to determine the impact of copyright on the prices of books, which is a task that has not, to my knowledge, been undertaken before. Recent prices of best-sellers written between 1895 and 1940, some with copyright and some without, are compared. One set of empirical findings...