Published online by Cambridge University Press: 13 June 2011
The conditions under which states will cooperate to impose economic sanctions are of both theoretical and practical interest. Generally, when sanctions are used, one state takes the lead in organizing and imposing them. Other states have incentives to free ride on the “leading sender's” efforts. To gain cooperation, the leading sender uses tactical issue-linkage in the form of either threats or side payments. The success of cooperation depends on the credibility of these issue-linkages. The use of high-cost sanctions and international institutions raises the potential for high audience costs if the leading sender reneges. These policies thus indicate credible commitments. Data on ninety-nine cases of post-1945 economic sanctions show that costly measures coincide with high levels of international cooperation.
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40 This game could also be modeled with State A deciding whether to make side payments if B does impose sanctions. The equilibria are similar to those in this threat game.
41 This is one conclusion that clearly differs from what we would find in a signaling game. With incomplete information, one usually finds some equilibria that include the carrying out of threats.
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43 Although it is the most comprehensive descriptive study of sanctions to date, Economic Sanctions Reconsidered (fn. 3) has been criticized for some of its methods. Other students of economic sanctions have questioned in particular the definition and measurement of success. Hufbauer, Schott, and Elliott define success narrowly as a desired policy change in the target country; they constructed a 16-point scale that captures varying degrees of success. Baldwin, for one, disagrees with this definition; see Baldwin (fn. 1), 130–34. The 16-point scale also takes into account the contribution of sanctions to the observed change in policy, which perhaps is better left as a separate variable. Economic Sanctions Reconsidered also exhibits some weaknesses from a statistical perspective. Because the 16-point success scale is constructed by the multiplication of two 4-point scales, it is impossible for any case to achieve certain values, such as 7, 13, 14, and so forth. The results also do not meet the usual standards of statistical significance and examine only bivariate rather than multivariate relationships, so that correlations among the independent variables make the observed relationships unreliable. In this study, I do not use the success score but use only Hufbauer, Schott, and Elliott's measures of some independent variables, along with additional variables added to their data set. I also develop statistical techniques appropriate for the kinds of data used, rather than relying on bivariate correlations.
44 Note that COST is not intended as a direct measure of audience costs. Instead, it is an indicator of the strategy adopted by the leading sender, with higher levels of COST indicating a higher-cost strategy. This is assumed to lead to higher audience costs in case of reneging.
45 Hufbauer, Schott, and Elliott (fn. 3), 1:35
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50 Ibid., 126–29.
51 These values are calculated by substituting the estimated parameters and specified values of COSTD and INST into the systematic component of the negative binomial model as given in Equation 1.
52 As discussed above, the positive coefficient of gamma indicates positive contagion, thus making precise predictions of the expected number of cooperating countries impossible. This is reflected in large confidence intervals around the expected value of NUMBER. For example, in all cases in Table 4, the lower bound of a 95% confidence interval would include NUMBER = 1. Thus, the fitted values should not be taken as precise estimates but only illustrative of the logic of the event count model. More important for interpretive purposes are the estimated parameter coefficients.
53 Martin (fn. 14), chaps. 5–8.