The outcome has been an embarrassing divorce between economic theory and its subjects.
The economic actor is assumed to be constantly engaged in the rational pursuit of self-interest. This is not a realistic model -- merely a useful approximation. According to this latter day, and rational, version of the dismal science, people refrain from repeating their mistakes systematically. They seek to optimize their preferences. Altruism can be such a preference, as well.
Still, many people are non-rational or only nearly rational in certain situations. And the definition of "self-interest" as the pursuit of the fulfillment of preferences is a tautology.
The theory fails to predict important phenomena such as "strong reciprocity" -- the propensity to "irrationally" sacrifice resources to reward forthcoming collaborators and punish free riders. It even fails to account for simpler forms of apparent selflessness, such as reciprocal altruism -- in which one is motivated by hopes of reciprocal benevolent treatment in the future.
Even the authoritative and mainstream 1995 "Handbook of Experimental Economics," by John Hagel and Alvin Roth admits people do not behave in accordance with the predictions of basic economic theories, such as the standard theory of utility and the theory of general equilibrium. Irritatingly for economists, people change their preferences mysteriously and irrationally in a process called "preference reversals."
Moreover, people's preferences, as evidenced by their choices and decisions in carefully controlled experiments, are inconsistent. They tend to lose control of their actions or procrastinate because they place greater importance, or "weight," on the present and near future than on the far future. This makes most people both irrational and unpredictable.
Either one cannot design an experiment to test theorems and conjectures in economics rigorously and validly, or something is very flawed with the intellectual pillars and models of this field.
Neo-classical economics has failed on several fronts simultaneously. This multiple failure led to despair and the re-examination of basic precepts and tenets.
Consider this sample of outstanding issues:
Unlike other economic actors and agents, governments are accorded a special status and receive special treatment in economic theory. Government is alternately cast as a saint, seeking selflessly to maximize social welfare -- or as the villain, seeking to perpetuate and increase its power ruthlessly, as per public choice theories.
Both views are caricatures of reality. Governments indeed seek to perpetuate their clout and increase it -- but they do so mostly in order to redistribute income and rarely for self-enrichment.
Economics also failed until recently to account for the role of innovation in growth and development. The discipline often ignored the specific nature of knowledge industries, where returns increase rather than diminish and network effects prevail. Thus, current economic thinking is woefully inadequate to deal with information monopolies, such as Microsoft, path dependence, and pervasive externalities.
Classic cost/benefit analyses fail to tackle very long-term investment horizons. Their underlying assumption -- the opportunity cost of delayed consumption -- fails when applied beyond the investor's useful economic life expectancy. People care less about their grandchildren's future than about their own. This is because predictions concerned with the far future are highly uncertain and investors refuse to base current decisions on fuzzy "what ifs."
This is a problem because many current investments, such as the fight against global warming, are likely to yield results only decades hence. There is no effective method of cost/benefit analysis applicable to such time horizons.
How are consumer choices influenced by advertising and by pricing? No one seems to have a clear answer. Advertising is concerned with the dissemination of information. Yet it is also a signal sent to consumers that a certain product is useful and of high quality, and that the advertiser's stability, longevity, and profitability are secure. Advertising communicates a long-term commitment to a winning product by a firm with deep pockets. This is why patrons react to the level of visual exposure to advertising -- regardless of its content.
Humans may be too multi-dimensional and hyper-complex to be usefully captured by econometric models. These models either lack predictive powers or lapse into logical fallacies, such as the "omitted variable bias" or "reverse causality." The former is concerned with important variables unaccounted for, the latter with reciprocal causation, when every cause is also caused by its own effect.
These are symptoms of an all-pervasive malaise. Economists are simply not sure what precisely constitutes their subject matter. Is economics about the construction and testing of models in accordance with certain basic assumptions? Or should it revolve around the mining of data for emerging patterns, rules, and "laws"?
On the one hand, patterns based on limited -- or worse, non-recurrent -- sets of data form a questionable foundation for any kind of "science." On the other hand, models based on assumptions are also in doubt because they are bound to be replaced by new models with new, hopefully improved, assumptions.
One way around this apparent quagmire is to put human cognition, or psychology, at the heart of economics. Assuming that being human is an immutable and knowable constant, it should be amenable to scientific treatment. "Prospect theory," "bounded rationality theories," and the study of "hindsight bias" as well as other cognitive deficiencies are the outcomes of this approach.
To qualify as science, economic theory must satisfy the following cumulative conditions:
a. All-inclusiveness, or anamnetic -- It must encompass, integrate, and incorporate all the facts known about economic behavior;
b. Coherence -- It must be chronological, structured and causal. It must explain, for instance, why a certain economic policy leads to specific economic outcomes, and why;
c. Consistency -- It must be self-consistent. Its sub-"units" cannot contradict one another or go against the grain of the main "theory." It must also be consistent with the observed phenomena, both those related to economics and those pertaining to non-economic human behavior. It must adequately cope with irrationality and cognitive deficits;
d. Logical compatibility -- It must not violate the laws of its internal logic and the rules of logic "out there," in the real world;
e. Insightfulness -- It must cast the familiar in a new light and mine patterns and rules from big bodies of data. Its insights must be the inevitable conclusion of the logic, the language, and the evolution of the theory;
f. Aesthetic -- Economic theory must be both plausible and "right," aesthetic, not cumbersome, not awkward, not discontinuous, smooth, and so on;
g. Parsimony -- The theory must employ a minimum number of assumptions and entities to explain the maximum number of observed economic behaviors;
h. Explanatory powers -- It must explain the behavior of economic actors, their decisions, and why economic events develop the way they do;
i. Predictive or prognostic powers -- Economic theory must be able to predict future economic events and trends as well as the future behavior of economic actors;
j. Prescriptive powers -- The theory must yield policy prescriptions, much like physics yields technology. Economists must develop "economic technology" -- a set of tools, blueprints, rules of thumb, and mechanisms with the power to change the "economic world;"
k. Imposing -- It must be regarded by society as the preferable and guiding organizing principle in the economic sphere of human behavior;
l. Elasticity -- Economic theory must possess the intrinsic abilities to self organize, reorganize, give room to emerging order, accommodate new data comfortably, and avoid rigid reactions to attacks from within and from without.
Many current economic theories do not meet these cumulative criteria and are, thus, merely glorified narratives.
But meeting the above conditions is not enough. Scientific theories must also pass the crucial hurdles of testability, verifiability, refutability, falsifiability, and repeatability. Yet, many economists go as far as to argue that no experiments can be designed to test the statements of economic theories.
It is difficult, perhaps impossible, to test hypotheses in economics for five reasons.
a. Ethical -- Experiments would have to involve human subjects, ignorant of the reasons for the experiments and their aims. Sometimes even the very existence of an experiment will have to remain a secret, as with double blind experiments. Some experiments may involve unpleasant experiences. This is ethically unacceptable;
b. Design problems -- The design of experiments in economics is awkward and difficult. Mistakes are often inevitable, however careful and meticulous the designer of the experiment;
c. The Psychological uncertainty principle --T he current mental state of a human subject theoretically can be fully known. But the passage of time and, sometimes, the experiment itself influence the subject and alter his or her mental state -- a problem known in economic literature as "time inconsistencies." The very processes of measurement and observation influence the subject and change it.
d. Uniqueness -- Experiments in economics, therefore, tend to be unique. They cannot be repeated even when the same subjects are involved, simply because no human subject remains the same for long. Repeating the experiments with other subjects casts in doubt the scientific value of the results;
e. The undergeneration of testable hypotheses -- Economic theories do not generate a sufficient number of hypotheses, which can be subjected to scientific testing. This has to do with the fabulous, or storytelling, nature of the discipline.
In a way, economics has an affinity with some private languages. It is a form of art and, as such, it is self-sufficient and self-contained. If certain structural, internal constraints and requirements are met, a statement in economics is deemed to be true even if it does not satisfy external, scientific requirements. Thus, the standard theory of utility is considered valid in economics despite overwhelming empirical evidence to the contrary, simply because it is aesthetic and mathematically convenient.
So, what are economic "theories" good for?
Economic "theories" and narratives offer an organizing principle, a sense of order, predictability, and justice. They postulate an inexorable drive toward greater welfare and utility, such as the idea of progress. They render our chaotic world meaningful and make us feel part of a larger whole. Economics strives to answer the "whys" and "hows" of our daily life. It is dialogic and prescriptive. In certain ways, it is akin to religion.
In its catechism, the believer, (let's say, a politician, asks: "Why ... (and here follows an economic problem or behavior)."
The economist answers: "The situation is like this not because the world is whimsically cruel, irrational, and arbitrary--but because ... (and here follows a causal explanation based on an economic model). If you were to do this or that the situation is bound to improve."
The believer feels reassured by this explanation and by the explicit affirmation that there is hope providing he follows the prescriptions. His belief in the existence of linear order and justice administered by some supreme, transcendental principle is restored.
This sense of "law and order" is further enhanced when the theory yields predictions that come true, either because they are self-fulfilling or because some real "law," or pattern, has emerged. Alas, this happens rarely. As The Economist notes gloomily, economists have the most disheartening record of failed predictions -- and prescriptions.