Click to increase image sizeClick to decrease image size Additional informationNotes on contributorsWilliam B. Walstad William B. Walstad is a professor of economics and director, National Center for Research in Economic Education, University of Nebraska. The author appreciated the cons'ructive comments from Peter Kennedy and two anonymous referees. Valuable assistance with data analysis was provided by Jeanette Iwasa.
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William B. Walstad (1997) studied this question.
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