|
National Bureau of Economic Research (United States)
70
|
Brookings Institution (United States)
27
|
Centre for Economic Policy Research (United Kingdom)
6
|
|
Center for International Development (United States)
3
|
International Institute for Environment and Development (United Kingdom)
1
|
Mathematica Policy Research (United States)
1
|
|
Overseas Development Institute (United Kingdom)
1
|
