Click to increase image sizeClick to decrease image size Additional informationNotes on contributorsJames E. HartleyJames E. Hartley is an assistant professor of economics, and Michael D. Robinson is associate professor of economics at Mount Holyoke College. The authors would like to thank William Becker, Robert Costrell, Eva Paus, Stephen Perez, and several anonymous referees for helpful comments.
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Hartley et al. (1997) studied this question.
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