Social scientists have become increasingly aware that their work de pends upon adequate concepts of certain basic relationships among the people who comprise polities, economies, and societies. Government and politics, in particular, appear to consist almost exclusively of re lationships of power, influence, control, authority, leadership, coercion, persuasion, and manipulation. Even the most common and elementary statements of political science - that, for example, the Rio Grande is part of the boundary between Mexico and the United States and members of Congress are chosen in competitive...