WHILE STATES HAVE ALWAYS BEEN IN COMPETITION, modern states are in competition in an historically unique way. Only since the Second world War has it become generally appreciated that the mastery of technical change is vital to economic success, to such military security as is available, and, in short, to political achievement in a world in which expectations are unprecedentedly high. Since the political system of a state is inescapably a major factor in that state's overall performance, it follows that the efficiency and effectiveness of the world's various political systems are now, in an important sense, under long-term test. Whether over time most systems will tend to an asymptotic common performance, or whether some will reveal themselves as objectively ‘better’ than others is thus, really for the first time, a meaningful issue, and one which each succeeding generation can be expected to do a little more to resolve. In this context particular interest attaches in the immediate future to the relative performances of the United States, the Soviet Union, Japan, and Western Europe, the latter considered both as separate states and collectively. This article is concerned only with the United States, but a reference frame of permanent international competition, in accommodating to and capitalizing upon technical change, needs to be borne in mind throughout.