Routine immunization coverage estimated in surveys often substantially differs from figures reported in administrative records, presenting a dilemma for researchers and policy makers. Using high-frequency phone surveys and administrative records from government sources in 36 low- and...

Low fertilizer application by small farmers continues to inhibit crop yields around the world. The reasons behind low application rates continue to be debated. We study the longer-term outcomes of a field experiment which focused on increasing fertilizer use. The original experiment showed that...