In a 2012 doctoral dissertation that extended Mills' "Power Elite", Muhammed Asadi argued that the modern world system is highly militarized and a counterpart of the US permanent war economy where a global division of labor based on military Keynesian stabilization exists concomitant with economic accumulation. Asadi called these countries , whose economic growth stabilizes the world system run by the (counterpart to Wallerstein's core countries but includes military and political domination in addition to financial and trade domination) just like military spending in the US stabilizes the US economy. Militarization and wars are therefore encouraged by the command states and facilitated by them just as suggested by Mills in "The Causes of World War Three" (1958): the preparation for war leads to wars.