Two doctrines have been greatly influential in this century  The first holds that the explanation of any historical event must appeal to economic factors  The second attempts to account psychologically for all historical events, especially in terms of early childhood experience  Both doctrines, however, are mistaken
Certainly there have been events that were due both to economic forces and to the nature of the early childhood experiences of the major participants in the event
One is likely to find that both economic and psychological explanations have been proposed for any given historical event.