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US President Donald Trump has announced sweeping tariffs on global trade, adding taxes of as much as 50% to imports from some countries.

The tariffs, he says, are 鈥渞eciprocal鈥� 鈥� calculated to address currency manipulation and trade barriers that other countries place on the US.

However, when you look at how the new tariffs were actually calculated, that claim does not add up.

Tim Harford speaks to Thomas Sampson, an associate professor at the London School of Economics, to understand what is going on.

Presenter: Tim Harford
Producers: Lizzy McNeill and Nathan Gower
Series producer: Tom Colls
Production co-ordinator: Brenda Brown
Sound mix: Neil Churchill
Editor: Richard Vadon