Tariffs, sanctions and chokepoints have become the weapon of choice to punish political rivals - but what happens when these fail? Gideon discusses the impact of geopolitical disputes on global trade with Edward Fishman, author of Chokepoints: American Power in the Age of Economic Warfare. Clip: Al Jazeera

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Presented by Gideon Rachman. Produced by Fiona Symon. Sound design is by Sean McGarrity.

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