https://nationalpost.com/news/canada/anita-anand-interprovincial-trade
Fortunately, Australia never adopted internal trade barriers like Canada did.
https://vancouversun.com/news/bc-eyes-nova-scotia-bill-reduce-interprovincial-trade-barriers
https://www.ctvnews.ca/politics/article/why-is-it-so-hard-to-do-business-between-provinces
https://www.conferenceboard.ca/insights/insights-blogs-time-to-rethink-internal-trade-in-canada
There are some things that Australia got correct early on, why Canada is still trying to sort some issues out.
https://www.cbc.ca/news/business/interprovincial-trade-barriers-4-ways-1.7453530
"Canada has free trade agreements with 51 countries, and yet we have never been able to institute free trade within our own borders.
Despite decades of discussion, an array of non-tariff barriers still limits the free movement of people and goods across our provinces. From professional certifications to supply-managed products to regulations in a wide variety of industries, restrictions on interprovincial trade flows prevail." https://financialpost.com/news/economy/beyond-borders-internal-trade-barriers
Federalism and Sub-National Protectionism: a Comparison of the Internal Trade Regimes of Canada and Australia https://www.queensu.ca/iigr/sites/iirwww/files/uploaded_files/SmithAndrewWorkingPaper2015.pdf
