Abstract
For over three decades, numerous studies on the impact of the United States Supreme Court have made it obvious that the legal rules and policy preferences of the Court do not automatically determine the decisions of the lower courts. An extensive literature now exists to detail the nature and extent of the impact of the Supreme Court on the courts below. The picture of judicial impact that emerges from this literature is characterized by numerous differences in the way the “impact” of the Supreme Court is conceptualized. The present study explores the differences in interpretation that might result from the application of four separate approaches to the study of judicial impact. Each of these four methods is applied in turn to evaluate the impact of the Supreme Court's decision in
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