In this introductory essay to the special issue, we introduce a new dataset of foreign assistance, AidData, that covers more bilateral and multilateral donors and more types of aid than existing datasets while also improving project-level information about the purposes and activities funded by...

We employ AidData to test the effects of primary-education aid on school enrollment. We argue that the problem of adverse selection complicates both the allocation and the effectiveness of aid. We hypothesize that bilateral donors ought to have greater freedom to condition aid on recipient...