The former U.S. Trade Representative, diplomat and World Bank president talks about his 40-year relationship with China, including refreshing the WTO deal; the danger of fortress economies; why engagement hasn't failed; and what he thinks about Xi Jinping.

The lionized economist talks about alternatives and counterfactuals in the U.S.-China relationship; the lessons from both the Japanese and Russian experiences; and why truculence is never productive.

The chief U.S. negotiator when China joined the WTO reflects on the surprises and failures of that landmark deal and why she thinks the U.S. can stay preeminent, even if it's not predominant.