Edward Bellamy
Nassim Nicholas Taleb
Philip E. Tetlock
Nate Silver
James Dale Davidson
Shoshana Zuboff
Joel Grus
Amos N. Wilson
Jack D. Schwager
A. J. Frost
Michael A. Hitt
Donella H. Meadows
Steve Nison
Mary Stewart Relfe
Peter Zeihan
Peter H. Diamandis
United States. General Accounting Office
International Monetary Fund.