The authors are arguing that, yes, the evidence suggests that having a limited amount of patent protection makes countries slightly more innovative, presumably by encouraging inventors to cash in on their great ideas without fear of being ripped off. But patent protections never stay small and tidy. Instead, entrenched players like intellectual property lawyers who make their living filing lawsuits and old, established corporations that want to keep new players out of their markets lobby to expand the breadth of patent rights. And as patent rights get stronger, they take a serious toll on the economy, including our ability to innovate. 

via The Case for Abolishing Patents (Yes, All of Them) - Business - The Atlantic.