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.
Paul KrugmanRelated topics
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Macro rational expectations, as I have labeled the hypothesis, seems to say that expectations in an economist's model must be perfectly consistent with his model that embodies these expectations. In other words, the agents of his model must all share his views of the relevant economic mechanisms, as well as his data. Why? Because if he holds them they must believe they are God's truth and, if so, rational people can have no other views (and of course we should never ask how they would come by these views and data, that not even other specialists may have heard of yet, let alone accepted). I submit that this view is pretty absurd--I would almost say offensive! I certainly believe that I know more about economics and the economy than (almost) everybody else, and i can even prove it: If everybody shared my vies, then the economy could not be in today's troubles.
Franco Modigliani
As conceived in this book, economics is the science of rational choice in a world─our world─in which resources are limited in relation to human wants. The task of economics, so defined, is to explore the implications of assuming that man is a rational maximizer of his ends in life, his satisfactions─what we shall call his "self-interest.” Rational maximization should not be confused with conscious calculation. Economics is not a thoery about consciousness. Behavior is rational when it conforms to the model of rational choice, whatever the state of mind of the chooser.(...) Nor is perfect rationality assumed; rational-choice thoery allows us to assume that rationality is "bounded” because of human cognitive limitations, although another way to think of those limitations is as costs of absorbing and using information.
Richard Posner
Systems science and technology constitute one aspect of systems thinking, but the humanities and arts make up the other. The fact that design plays such a large part in the systemic treatment of problems makes it apparent that art has a major role in it as well. Ethics and aesthetics are integral aspects of evaluating systems... the systems approach involves the pursuit of truth (science) and its effective use (technology), plenty (economics), the good (ethics and morality), and beauty and fun (aesthetics). To compare systems methodology with that of any of the so-called ‘hard' disciplines-for example, physics-is to misunderstand the nature of systems. The worry is not that the systems approach is not scientific in the sense which physics or chemistry or biology is, but that some try to make it scientific in that sense. To the extent they succeed, they destroy it.
Russell L. Ackoff
This view that the action of the Federal Reserve authorities in 1927 was responsible for the speculation and collapse which followed has never been seriously shaken. There are reasons why it is attractive. It is simple, and it exonerates both the American people and the economic system from substantial blame... Yet the explanation obviously assumes that people will always speculate if only they can get the money to finance it. Nothing could be farther from the case. There were times before and there has been long periods since when credit was plentiful and cheap -- far cheaper than in 1927-29 -- and when speculation was negligible. Nor was speculation out of control after 1927, except that it was beyond the reach of men who did not want in the least to control it. The explanation is a tribute only to a recurrent preference, in economic matters, for formidable nonsense.
John Kenneth Galbraith
It must always be borne in mind that each and every individual is not only a producer but a consumer. In the final analysis of our conditions, we have to admit that it is not lack of consumption, but lack of production which is our present economic danger. The immigrant is needed, provided this fact is overcome, provided supply-whether in schools, in homes, or in shoes-does not fall behind demand. The public could today consume much more of the necessities of food, shelter and clothing than they are able to procure or have ever been able to procure in a country where the standard of living is so high. If, through cheap labor, and an increased willingness on the part of alien labor to live on the edge of existence, these standards are threatened, then is the time to bring legislative action to bear on the situation.
Calvin Coolidge