That could be a good complement. It might create some problems in terms of fairness among the provinces. Indeed, it would have to be decided which price, among the various prices set in the provinces, would be used to measure the contribution paid for products entering Canada.
Careful thought should be given to this, however, because the six sectors where this has been implemented in the European Union are mainly sectors where the European Union is an importer, whereas in a number of these sectors, including the aluminum sector, Canada is an exporter. So things should be done a little differently from what is being done in the European Union.