The 1867 Founders put unfettered interprovincial free trade in the Constitution. A 1921 Supreme Court decision suffering from a Prohibition hangover took it out, and Canada’s economy has suffered from domestic protectionism ever since. All this could be fixed, says Marni Soupcoff – and perhaps even the distortions of Equalization lessened, as well – with litigation aimed at restoring the Founders’ original intent.