|
National Bureau of Economic Research (United States)
16
|
Brookings Institution (United States)
8
|
Urban Institute (United States)
6
|
|
Centre for Economic Policy Research (United Kingdom)
5
|
Energy Policy Research Group (United Kingdom)
5
|
Fraser Institute (Canada)
5
|
|
Mathematica Policy Research (United States)
4
|
Center for Strategic and International Studies (United States)
2
|
American Enterprise Institute (United States)
1
|
|
Center for Education Policy Analysis (United States)
1
|
Centre for International Governance Innovation (Canada)
1
|
Chatham House (United Kingdom)
1
|
|
Environment for Development Initiative (Sweden)
1
|
Fondazione Eni Enrico Mattei (Italy)
1
|
Overseas Development Institute (United Kingdom)
1
|
|
Pembina Institute (Canada)
1
|
RAND Corporation (United States)
1
|
Resources for the Future (United States)
1
|
