How to Double the Number of Teachers in Schools

Abijit found the simplest setting for the experiment in a rural area in the state of rajastan. Many poor schools had just one teacher. Abijith took a set of forty schools, picked at random, he doubled the number of teachers to two. The results came in: In schools with two teachers, test cores of students changed by nada. There was zero. A fact, i think our first reaction was, we're doing something wrong. Let's go measure better. And so we did, i think, extremely expensive and painful measurement, and found nothing.