Donald Trump's strategy on tariffs is inspired by the 'Gilded Age' of US history, when the federal government drew most of its income from taxes on foreign imports.
Now some of America's closest allies have been slapped with tariffs and there are growing risks of a trade war.
Guest: Justin Wolfers, professor of public policy and economics at the Gerald R. Ford School of Public Policy, University of Michigan
Recommendations:
Geraldine: 'The Wonders of Europe', SBS on Demand
Hamish: Sir Gareth Southgate - Boys need role models not gaming and porn, BBC
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Global Roaming with Geraldine Doogue and Hamish Macdonald