As Donald Trump threatens Canada with an economic war, the country’s political and business class agree that we have to tear down the barriers to trade across provinces. They claim removing these barriers would reduce prices by 15 percent and add 200 billion dollars to Canada’s GDP. Stuart Trew says business lobbyists and right-wing think tanks are exploiting Trump’s threats to push their deregulation agenda. Stuart Trew is a senior researcher with the Canadian Centre for Policy Alternatives where he directs the Trade and Investment Research Project.