You are negating the exogenous effects. Canada competes with other jurisdictions ... Not only compared to wages paid in those
other countries, provinces, states, etc., but for tourist dollars.

The argument that a state can levy costs universally and 
therefore affect all economic actors equally is wrong headed.

Corporations may in fact quietly lobby for social changes they
can easily bear — while pleading otherwise — while small 
businesses cannot pass on those costs. The argument you
are positing is specious. 

And overlooked are silly notions about what constitutes 
a service job as opposed to manufacturing jobs. Peter
Drucker encouraged the view that manufacturing was 
more or less old hat. But he did not foresee the effects 
of the "super symbolic" economy on manufacturing.

Unfortunately neither do many politicians. When the State
operates to intrude in the marketplace by anticipating 
the future, the economy declines — as it has.