Which case upheld the flow for interprovincial trade while managing intraprovincial regulation?

The case that upheld the flow for interprovincial trade while managing intraprovincial regulation is Dominion Stores v The Queen. This case is significant in Canadian constitutional law as it addresses the balance between federal and provincial powers, particularly concerning the regulation of trade and commerce.

In Dominion Stores, the Supreme Court of Canada dealt with issues related to the regulation of commerce across provincial boundaries while allowing provinces to regulate their own affairs. The ruling articulated the importance of maintaining a seamless marketplace across Canada, ensuring that lawfully traded goods could move freely between provinces. At the same time, it recognized the validity of provincial legislation that could impose regulations on businesses operating within their jurisdictions, as long as such regulations do not conflict with federal statutes.

This case helped clarify the scope of both federal and provincial legislative powers under the Constitution Act, 1867, by reinforcing that while interprovincial trade needs to remain unfettered, provinces still retain the authority to regulate activities within their borders. The interplay of these two layers of regulatory authority is a fundamental principle in Canadian federalism, emphasizing cooperation and balance between different levels of government.

Other cases mentioned, while important in different contexts, do not address the specific dynamic between promoting interprovincial trade and allowing for intr