comparative advantage. We test students who have been exposed to the typical textbook and classroom presentation of specialization … and trade with real but paradoxical situations where the same goods are both imported and exported by a country. Students …

. Using data from three recent studies in South Asia and Africa, we show that a majority of students spend years of …

of less able students. As we argue in the paper, this adjustment benefits low-ability college students at the expense of … colleges become a less appealing alternative for the medium ability students. The selective, elite colleges therefore adopt a … more demanding curriculum to better serve their most able students, again at the expense of medium ability students. The …