By Christopher Wilson and Sabrina Spencer (December 15, 2017, 8:38 AM EST) -- The Supreme Court of Canada heard arguments last week (Dec. 6 and 7) about the constitutionality of prohibitions on interprovincial shipping of wine, beer and spirits. The court’s decision has the potential to affect all barriers to trade between provinces, including provincial liquor corporations and dairy and poultry boards which carefully manage quotas and trade restrictions or have an outright monopoly on the sale of products within their jurisdiction....