I appreciate the question. The passage you've read is an important one, and it expresses themes that we can find in many different cases involving the interpretation of the division of legislative powers. The Supreme Court of Canada is very concerned about a balanced approach and prefers co-operative solutions, and the securities act reference is a prime example of that.
However, each head of power has its own distinct characteristics and the interpretation of its scope and limits is different, so the national concern branch of POGG is a little bit different from the general regulation of trade branch of the trade and commerce power. It's helpful in thinking about whether this a subject matter that could be upheld under the national concern branch of POGG. It's helpful to keep in mind those concerns for sure, but also to keep in mind what subject matters have been allocated in the past to the POGG national concern branch, what the features are that they share, and whether we could we say that elements of pharmacare share those features.
What are those subject matters? In the modern era, it's aeronautics, and not just international or interprovincial airline traffic, but all, including all the local aspects.
It's nuclear power.
It's the national capital region. The zoning of the national capital region would normally be provincial or municipal, but as you know, it is conducted to a large extent by the federal Parliament.
It's marine pollution in the Crown Zellerbach case.
What the court said, or has said, and what scholars have said about this handful of examples—because that's really all we have from the modern era—is that they're each specific and focused in their definition so that they don't upset the balance in the division of powers to a great deal if we allocate them to exclusive federal jurisdiction, because that's the effect of the POGG national concern branch. It's as if you had a new head of federal power. It's as though marine pollution is now written into section 91, as well as aeronautics and the other examples I mentioned. They're very specific in focus. The words the court uses are not too diffuse; they're not so lacking in definition that they have no bounds that we can identify.
The other argument that has been made in the scholarship and in the case law is that the provinces lack the ability to deal with the matter effectively. If we were to leave some aspects of the regulation of air traffic, for example, to local governments, there would be serious risks for the safety of travel by air, and there's a strong case for national, and indeed international, regulation.