Performance is an essential element of punditry. Once you sit before a microphone or in front of the cameras, you become a different person. Academics have to master the art of the sound bite. Journalists have to make their words come alive. And policy wonks have to attempt the impossible and become entertaining. For any of these talking heads, ignorance is not an option. The interviewer — and by extension, the audience — expects answers that are short and sweet, and that, preferably, predict the future.