A number of studies have examined the impact of changes in price on students' enrollment decisions at the undergraduate level, but little is known about the price responsiveness of graduate and professional students. This dissertation utilizes difference-in-differences and regression-discontinuity methods to analyze student-level data for admitted students at a graduate/professional school at a highly selective public institution. Difference-in-differences is employed to evaluate the impact of a change in the scholarship name of an existing institutional financial aid program on immediate enrollment at the institution, while regression-discontinuity is utilized to evaluate the impact of merit scholarships on the same outcome. These causal research designs aim to provide more robust institution-level findings regarding the various ways in which financial aid can impact graduate/professional student enrollment decisions. The results indicate that the change in scholarship name did not induce increases in enrollments. Small and medium scholarship amounts did have an impact on enrollment decisions among high-test score and high-GPA students, respectively. Compared to no scholarship offer, admitted students receiving a small- or medium-level merit scholarship were much more likely to enroll. Also examined was the impact of the scholarship receipt among important subgroups of students, such as by race/ethnicity, sex, and residency status. This research adds to the body of student price responsiveness literature by providing the first rigorous analyses of the impact of institutional scholarships on graduate/professional school enrollment. In light of increases in graduate/professional school enrollment broadly, this paper serves as a framework for enrollment management administrators and financial aid professionals to conduct assessments of their own programs and leverage institutional aid programs. [The dissertation citations contained here are published with the permission of ProQuest LLC. Further reproduction is prohibited without permission. Copies of dissertations may be obtained by Telephone (800) 1-800-521-0600. Web page: http://bibliotheek.ehb.be:2222/en-US/products/dissertations/individuals.shtml.]