Should We Trust Economists?

Imagine you are the Royal Physician in England some time during the 14th century. The prince is sick, and you've been summoned to help. You call in two experts for advice. The first says: "Use leeches to suck out the evil humors." The second says "No, you must bleed him to get the evil humors out." They start to argue, insulting each other in nasty epistles. "Leech guy is secretly working for the French!" alleges Bleeding Guy. "Bleeding Guy just wants the prince to die because the prince wanted higher taxes on the nobles!" Leech Guy fires back.