Mark Carney is facing a challenge familiar to many company leaders: how to deal with a more powerful partner you can’t afford to lose.

The Canadian prime minister is in a trade fight with US President Donald Trump. Though Carney lacks the upper hand because Canada depends more on access to the US market than vice versa, he walked away from trade talks with Trump, arguing that the US had produced unfair terms.

The dispute has escalated in recent days, with Washington imposing new tariffs on Canadian goods and Ottawa announcing retaliatory ones on US imports.

Whether Carney’s approach ultimately benefits Canada remains unclear. For business…