|
National Bureau of Economic Research (United States)
13
|
American Enterprise Institute (United States)
8
|
Centre for Economic Policy Research (United Kingdom)
6
|
|
Center for International Development (United States)
2
|
Wuppertal Institute for Climate, Environment and Energy (Germany)
2
|
Konrad Adenauer Foundation (Germany)
1
|
|
Overseas Development Institute (United Kingdom)
1
|
