When Opportunity Knocks, Who Answers?
研究加拿大一所通勤大学中，为大一和大二学生提供的学业成绩奖励（线性现金激励）的效果，发现项目参与度高但总体影响小，仅对二年级学生有微弱正面作用。
Abstract We evaluate the effects of academic achievement awards for first-and second-year college students studying at a Canadian commuter college. The award scheme offered linear cash incentives for course grades above 70. Awards were paid every term. Program participants also had access to peer advising by upperclassmen. Program engagement appears to have been high but overall treatment effects were small. The intervention increased the number of courses graded above 70 and points earned above 70 for second-year students but generated no significant effect on overall GPA. Results are somewhat stronger for a subsample of applicants who correctly described the program rules.