US president Donald Trump issued his latest tranche of tariffs this week, as talks between the United States and Canada broke down. But what would economists of the past have made of his ongoing trade war? Regular panellists Rana Mitter and Hannah Skoda look back at the historical parallels.

Plus, with summer holiday season coming to an end, they explore the innovations that have made international travel easier – and, on occasion, more exasperating throughout the centuries.

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