Economics is haunted by more fallacies than any other study known to man. This is no accident. The inherent difficulties of the subject would be great enough in any case, but they are multiplied a thousand fold by a factor that is insignificant in, say, physics, mathematics or medicine-the special pleading of selfish interests. While every group has certain economic interests identical with those of all groups, every group has also, as we shall see, interests antagonistic to those of all other groups. While certain public policies would in the long run benefit every- body, other policies would benefit one group only at the expense of all other groups. The group that would benefit by such policies, having such a direct interest in them, will argue for them plausibly and persistently. I t will hire the best buyable minds to devote their whole time to presenting its case. And it will finally either convince the general public that its case is sound, or so befuddle it that clear thinking on the subject becomes next to impossible.
In addition to these endless pleadings of self-interest, there is a second main factor that spawns new economic fallacies every day. This is the persistent tendency of men to see only the immediate effects of a given policy, or its effects only on a special group, and to neglect to inquire what the long-run effects of that policy will be not only on that special group but on all groups. It is the fallacy of overlooking secondary consequences.
In this lies almost the whole difference between good such shallow wisecracks pass as devastating epigrams and the ripest wisdom.
But the tragedy is that, on the contrary, we are already suffering the long-run consequences of the policies of the remote or recent past. Today is already the tomorrow which the bad economist yesterday urged us to ignore. The long-run consequences of some economic policies may become evident in a few months. Others may not become evident for several years. Still others may not become evident for decades. But in every case those long-run consequences are contained in the policy as surely as the hen was in the egg, the flower in the seed.
From this aspect, therefore, the whole of economics can be reduced to a single lesson, and that lesson can be reduced to a single sentence.
Nine-tenths of the economic fallacies that are working such dreadful harm in the world today are the result of ignoring this lesson. Those fallacies all stem from one of two central fallacies, or both: that of looking only at the immediate consequences of an act or proposal, and that of looking at the consequences only for a particular group to the neglect of other groups.
It is true, of course, that the opposite error is possible. In considering a policy we ought not to concentrate only on its long-run results to the community as a whole. This is the error often made by the classical economists. It resulted in certain callousness toward the fate of groups that were immediately hurt by policies or developments which proved to be beneficial on net balance and in the long run.
But comparatively few people today make this error; and those few consist mainly of professional economists. The most frequent fallacy by far today, the fallacy that emerges again and again in nearly every conversation that touches on economic affairs, the error of a thousand political speeches, the central sophism of the "new" economics, is to concentrate on the short-run effects of policies on special groups and to ignore or belittle the long-run effects on the community as a whole. The "new" economists flatter themselves that this is a great, almost a revolutionary advance over the methods of the "classical" or "orthodox" economists, because the former take into consideration short-run effects which the latter often ignored. But in themselves ignoring or slighting the l o n g run effects, they are making the far more serious error. They overlook the woods in their precise and minute examination of particular trees. Their methods and conclusions are often profoundly reactionary. They are some- times surprised to find themselves in accord with seven- twentieth-century mercantilism. They fall, in fact, into all the ancient errors (or would, if they were not so inconsistent) that the classical economists, we had hoped, had once for all got rid of.
It is often sadly remarked that the bad economists present their errors to the public better than the good economists present their truths. It is often complained that demagogues can he more plausible in putting forward economic nonsense from the platform than the honest men who try to show what is wrong with it. But the basic reason for this ought not to be mysterious. The reason is that the demagogues and bad economists are presenting half-truths. They are speaking only of the immediate effect of a proposed policy or its effect upon a single group. As far as they go they may often be right. In these cases the answer consists in showing that the proposed policy would also have longer and less desirable effects, or that it could benefit one group only at the expense of all other groups. The answer consists in supplementing and correcting the half-truth with the other half. But to consider all the chief effects of a proposed course on everybody often requires a long, complicated, and dull chain of reasoning. Most of the audience finds this chain of reasoning difficult to follow and soon becomes bored and inattentive. The bad economists rationalize this intellectual debility and laziness by assuring the audience that it need not even attempt to follow the reasoning or judge it on its merits because it is only "classicism" or "laissez faire" or "capitalist apologetics" or whatever other term of abuse may happen to strike them as effective.
We have stalled the nature of the lesson, and of the fallacies that stand in its way, in abstract terms. But the lesson will not be driven home, and the 'fallacies w continue to go unrecognized, unless both are illustrate by examples. Through them examples we can move from the most elementary problems in economics to the most complex and difficult. Through them we can learn to detect and avoid first the crudest and most palpable fallacies and finally some of the most sophisticated and elusive. To that task we shall now proceed.