Ian Bremmer is the president of Eurasia Group and author of Every Nation for Itself: Winners and Losers in a G-Zero World.

No matter what the critics say, oil revenue and foreign investment will guide Iraq to prosperity. Ian Bremmer on what happens once the Americans leave.

Roubini and Bremmer debate the real meaning of political and economic problems throughout the world—and whether the U.S. still has power. The latest installment in a continuing conversation.