President Donald Trump’s sudden move to slap a 50% tariff on Canadian goods is less about the northern neighbor and more a stark warning to the globe.

Economist Justin Wolfers argues the tariffs serve as a test case ahead of a broader global trade war.

A Warning Shot to the World Trump recently signed three proclamations imposing 50% duties on nearly $20 billion in Canadian imports.

However, Wolfers insists that the motive extends far beyond bilateral disputes.

"They're waiting for the next round of the global trade war," Wolfers explained.