Researchers conducted a randomized evaluation to test the impact of different types of labels to signal product quality on sellers’ ability to develop a reputation for consistently selling high-quality watermelons in China. The more expensive laser-cut label influenced sellers to provide higher quality watermelons than the sticker label. The use of the laser-cut label also led to higher sales profits, whereas the cheaper sticker label had no effect on profits.

Researchers conducted two randomized evaluations to test the impact of coaching teachers on integrating CAL in their elementary and middle school mathematics instruction in two large, diverse school districts in the United States. The intervention led to improved math performance in one evaluation and mixed results in the other, with test-score gains observed in classrooms with higher weekly CAL practice time.