If the patent protection is too strong, then a drug company may develop one drug and then rest for 100 years and not do anything more; or the musician may write one great song, live off it for 100 years, and not write the next song, because he doesn't have to.
Economists really have no idea—absolutely no idea—how strong intellectual property rights should be. We know that if they're too strong, it's bad. If they are too weak, it's bad. But we don't know what the right number is, and I am very worried that a lot of people in governments all over the world just think that stronger property rights are better, and that is just clearly not true. But where it should be, we don't have those numbers. We don't know.