Studies the social problem created by placing three rats in a Skinner box with the lever some distance from the food trough. At first, any rat pressing the lever finds the food eaten by others, and violent fighting over the empty trough ensues. Finally, one rat discovers a way to obtain food for all three by depressing the lever several times. With this rat as the worker and the other two as parasites, class society has emerged. O.H. Mowrer. Dated, but of historical interest. silent, 1939
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