We’re living in a Dark Age of macroeconomics. Remember, what defined the Dark Ages wasn’t the fact that they were primitive — the Bronze Age was prim… - Paul Krugman

Homo economicus is an implausible caricature, but a highly productive one, and no useful alternative has yet been found.

I do not think this is a permanent condition. The craziness comes more from cultural ethnic issues than anything else, because you have a… A lot of the real craziness come from, if you like, from rural who feel that they’re losing their country, they’re losing ownership of the country. And they are right—we are becoming more diverse, more multicultural. And in the end... they are not the future. In the end, the power they still have will go away. But it’s a very difficult time until then. So the future is Mayor Deblasio of New York, but Ted Cruz is still out there with the ability to do a lot of damage.

Keynes didn’t make an all-out assault on Economic Man, but he often resorted to plausible psychological theorizing rather than careful analysis of what a rational decision-maker would do. Business decisions were driven by “animal spirits,” consumer decisions by a psychological tendency to spend some but not all of any increase in income, wage settlements by a sense of fairness, and so on.
But was it really a good idea to diminish the role of Economic Man that much? No, said Friedman, who argued in his 1953 essay “The Methodology of Positive Economics” that economic theories should be judged not by their psychological realism but by their ability to predict behavior. And Friedman’s two greatest triumphs as an economic theorist came from applying the hypothesis of rational behavior to questions other economists had thought beyond its reach.