However, this simplification I'm ignores that, to protect businesses Canada has implemented output-based allocations, where the first n-tonnes per unit product of a large business are exempted, meaning that the cleanest and greenest businesses within an industry pay no carbon tax because they're below their output allocation. That prevents them from getting stomped by competitors without carbon pricing, but means a tremendous amount of GHGs in Canada will be going untaxed.

Yeah, we need to get $100 per tonne ASAP, and start forming coalitions with other countries so that we can use tariffs instead of output-based allocations to protect carbon taxed businesses from untaxed competitors.