DAVID WARREN: “We learned a simple thing this week: that the BP clean-up effort in the Gulf of Mexico is hampered by the Jones Act. This is a piece of 1920s protectionist legislation, that requires all vessels working in U.S. waters to be American-built, and American-crewed. So while, for instance, the U.S. Coast Guard can accept such help as three kilometres of containment boom from Canada, they can’t accept, and therefore don’t ask for, the assistance of high-tech European vessels specifically designed for the task in hand. This is amusing, in a way: a memorable illustration of … the sort of stuff I keep going on about. Which is to say, the law of unintended consequences, which pertains with especial virulence to all acts of government regulation.”