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Schengen: Europe's free-travel zone faces possible demise, with heavy cost to European businesses
"The two questions of freedom of movement for people and freedom of movement for commerce are not necessarily related," said Camino Mortera-Martinez, a research fellow at the Centre for European Reform. "But the closing of the border would create enormous obstacles to trains and trucks."
..."We've had border controls here and there forever," Mortera-Martinez said. "What we haven't had is a sustained closing of borders."