The development of an inter‐nation tensiometer

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Abstract
The military expenditure (M.E.) of a nation depends partly on its wealth as measured by its Gross National Product (GNP), partly on geography, and partly on its presence in an alliance. The authors describe a method for calculating the M.E. value if it depended solely on the GNP; the value of the M.E. so obtained is termed the theoretical M.E. (M.E.Th.). Dividing the actual M.E. by the M.E.Th. (and multiplying by 100) yields a pure number, the tension ratio (T.R.). We regard tension as a function of geography (thus having a hostile neighbor increases tension and having a friendly neighbor decreases tension) and of membership in an alliance (which should cause a relaxation of tension). Tension ratios were calculated for 63 countries. Of the 13 nations engaged in a war, 76.9 percent had T.R. values greater than 155. Of the 43 nations not engaged in a war, only 26 percent had T.R. values greater than 155. Application of the chi square tests and the Kolmogorov‐Smimov test showed the association of high T.R.s concurrent with wars and antecedent to wars to be significant at the 95 percent probability level. Threshold T.R. values can pinpoint critical, potentially violent situations. Membership in an alliance does not seem as important as the effect of geography (the geographic factor includes the perception of hostility or friendliness in a neighboring country).

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