Greg Mankiw wants answers: “After more than a quarter-century as a professional economist, I have a confession to make: There is a lot I don’t know about the economy. Indeed, the area of economics where I have devoted most of my energy and attention — the ups and downs of the business cycle — is where I find myself most often confronting important questions without obvious answers…”
Barry Ritholtz gives them to him: "Let’s put aside the fundamental error of classical economics — that Humans are rational, self-interested, profit maximizing creatures. They are clearly not; Humans are actually irrational social animals with flawed cognitive apparatus. Frequently emotional, occasionally self-destructive, often times erratic, humans only rarely exhibit the traits that economics ascribe to them. If the study of economics begins with such a shaky foundation, is it any wonder they get so much wrong?"
Lesson: listen to economists at your own peril.