Evaluation | Effect | Average Age | Observations | Experimental Evaluation | Country | Intervention |
---|---|---|---|---|---|---|
Fryer 2011 iii | 2 | Grade 4 | 6,507 | Yes | United States | Students received $5.64-$28 per test depending on academic achievement |
Fryer 2011 ii | 5 | Grade 2 | 3,660 | Yes | United States | Students received $2.26 per book read for up to 20 books |
Bettinger 2012 | 7 | Grade 5 | 1,978 | Yes | United States | Students received $19-$25 per passed test |
Li 2014 i | 3 | Grade 5 | 998 | Yes | China | Students received $8.04-$16 if among the top 3 in scores improvement |
Li 2014 ii | 30 | Grade 5 | 958 | Yes | China | Students working in pairs received payments for test scores increases |