It sounds duller than watching paint dry, but an issue called "supply management" is one of the key factors in Donald Trump's tariff decision.  

Trump has criticized Canada’s protected agriculture industries for years, and now he’s been pointing to supply management in the dairy sector as one of the reasons for his tariff threats.

 What is the decades-old policy that manages how much dairy product is produced in Canada? And why does Trump care about it?

Host David Smith gets a lesson in agriculture production and trade policy from The Food Professor, Sylvain Charlebois, Director of the Agrifood Analytics Lab at Dalhousie University.

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