Henry Hazlitt on why economics is prone to fallacies

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 thousandfold by a factor that is insignificant in, say, physics, mathematics or medicine — the special pleading of selfish interests.

 ~ Henry Hazlitt, Economics In One Lesson (1946)