Â鶹Éç

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Are Donald Trump's threats to impose tariffs on Chinese imports rational? The classic game of Prisoner's Dilemma suggests not. Ed Butler speaks to trade economist Meredith Crowley of Cambridge University, plus the Â鶹Éç's own in-house philosopher David Edmonds. Plus, what is all that got to do with a surfeit of men on the famous dating app Tinder? The Canadian political scientist and former lonely-heart Titouan Chassagne explains. (Photo: Boxing gloves with US and Chinese national flags imprinted on them punch one another; Credit: Zerbor/Getty Images)