Campaign contributions and voting on the cargo preference bill: A comparison of simultaneous models

Henry Chappell

Public Choice, 1981, vol. 36, issue 2, 312 pages

Abstract: A variety of single equation and simultaneous equation models have been employed to test the hypothesis that interest group campaign contributions influence congressional voting. Although contributions exhibited the anticipated positive effect in all models, the simultaneous equations estimates generally indicated much lower significance levels for the contribution coefficients than did the single equation models. The lower significance levels are apparently attributable to a lack of precision of the simultaneous model estimates (indicated by large standard errors) as well as possible bias of the single equation models. It was also found that qualitative results from the more sophisticated simultaneous probit-Tobit models were quite similar to those obtained from 2SLS estimation of the linear probability model. The overall results of the study are unavoidably ambiguous. Contributions did not show highly significant effects in the preferred simultaneous models, but the consistent sign pattern suggests that it would be inappropriate to conclude that contributions have no effects. Study of additional issues and interest groups may help to resolve some of ambiguity surrounding the contribution-voting relationship. Copyright Martinus Nijhoff Publishers 1981

Date: 1981
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DOI: 10.1007/BF00123786

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