The idea that some matters of legislation, in their local and provincial origins, could acquire national dimensions, thereby come within the federal Parliament's P.O.G.G power, is the core of the national concern branch of P.O.G.G. In your words, when does the subject matter of legislation become "the concern of the Dominion as a whole" so as to satisfy the national concern test? Provide a case example (with a brief summary of the Court's reasoning,) where the national concern branch of P.O.G.G was used as grounds for the Court's decision (or Privy Council). In your estimation, should the courts be interpreting POGG in ways that are more generous to the federal government?