in: Oxford Research Encyclopedia of Politics
The literature on international hierarchy is emerging as a progressive research program. This new theory of international relations is generating novel propositions that are being empirically confirmed. Some propositions, like the hierarchical peace, provide new explanations for previously identified phenomena. Other propositions on defense spending, crisis joining,e trade, and civil wars and repression establish new empirical relationships that—if they are not actually inconsistent with existing theories—were not previously identified. If the measure of progress is the uncovering of new facts, the new hierarchy studies are clearly moving in the right direction. Further progress requires more and better measures of hierarchy and continued testing of propositions derived from the theory.