 A copyright I think is very interesting because it affects something that is not necessarily related to technology. So it affects music or it affects writing, which could be just as important to people's welfare, but it is not captured in the patent system. Then the other thing that I think is really important about copyright is that it may actually affect the rate at which knowledge is created and the rate at which knowledge is diffused. So in the paper on the 1814 Copyright Act, we are trying to see whether longer copyright terms, a grant of longer exclusive rights, increases the price of books. Whether it makes it more expensive for readers to access a book when that book is protected for a longer period of time. And then how big that effect is, whether that actually that effect is large enough so that we should care. The paper is called Dead Poets Property. And the reason why we picked this title is because the main experiment compares books by dead authors with comparable books by living authors. And only books by dead authors benefited from the differential increase in copyright, whereas books by living authors, their actors are a control group. And they affected by all the other changes that happened in this industry at the same time, but they didn't benefit from the extension of copyrights to the same extent. So I think the way an extension in copyright increases the price of books is that it allows the copyright owner, who is the publisher, to maintain exclusivity for more years. So essentially, the copyright gives the publisher the right to prevent entry by competitors with a lower price addition. And I think our main contribution to this debate is a very narrow one. I think our paper is, to the best of my knowledge, at least one of the first that shows that longer extension in length of copyright actually do increase the price of intellectual assets. We can't really say whether this is good or bad yet, because we don't know how much does price increase contribute to encouraging creativity and how much, on the other hand, discourages diffusion. But what we know is that there is an increase in the price.