|
National Bureau of Economic Research (United States)
22
|
Urban Institute (United States)
20
|
Mathematica Policy Research (United States)
11
|
|
Overseas Development Institute (United Kingdom)
10
|
Centre for Economic Policy Research (United Kingdom)
9
|
American Enterprise Institute (United States)
8
|
|
RAND Corporation (United States)
4
|
Brookings Institution (United States)
3
|
World Resources Institute (United States)
3
|
|
Center for American Progress (United States)
1
|
International Institute for Environment and Development (United Kingdom)
1
|
James A. Baker III Institute for Public Policy (United States)
1
|
