Published online by Cambridge University Press: 26 October 2009
Approximate parity in power capabilities between states creates uncertainty of victory if war were to occur. Whether, therefore, decisional uncertainty inhibits war between states or makes a breaking of the peace likely, is a central question in the host of ‘balance of power’ theories of interstate conflict. Some argue one way; others a different way; and some appear to argue one way, then the other. For along time each found support in armchair reflection—common sense bolstered with diplomatic anecdotes from ancient and modern state systems. Arguments could be made to command diverse historical examples because they rested upon the common assumption that calculations of power, security and conflicts of interest are essentially the same in any system of sovereign states. Anarchy, if you will, orders anachronisms. Now, however, each side can find support in quantitative evidence from far more systematic empirical analyses. The latter analyses are intended to bring some order and discipline to contrary insights by replacing anecdote with data.
1. The elastic nature of the phrase ‘balance of power’ contributes to further confusions and disagreements. A. F. Pollard's lecture to the British Institute of International Affairs, and the discussion which followed provide a handy illustration of this. Pollard suggested that the number of uses of the phrase approaches many thousands. Martin Wight's discussion of nine meanings of the concept captures most of the variation in usage. Pollard, , ‘The Balance of Power’, Journal of the British Institute of International Affairs, xi (1923), pp. 51–64CrossRefGoogle Scholar, 81–3; Wight, ‘The Balance of Power’, in H. Butterfield and M. Wight (eds.), Diplomatic Investigations (London, 1966).
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70. Sources of figure and tables: Figure 1: Maddison, ‘Phases of Capitalist Development’; Maddison, Phases of Capitalist Development, Appendix A; Correlates of War Project, University of Michigan. Table 1: Ferris, Power Capabilities of Nation-States; Ferris, ‘A Theoretical and Empirical Analysis…’. Tables 2,3 and 4: Maddison, ‘Phases of Capitalist Development’; Maddison, Phases of Capitalist Development, Appendix A; Correlates of War Project, University of Michigan, Tables 5 and 6: Correlates of War Project, University of Michigan.