The US is about to present a NAFTA proposal on the content of cars which an unnamed analyst is quoted as calling “comical” and so complicated that he can’t believe the Americans are serious about it. A Canadian Press report datelined the Pentagon says that the proposal would require all cars sold without tariffs to include 85 per cent North American content, 50 per cent U.S. content and provide a detailed listing of parts that didn’t exist in 1994 when NAFTA was introduced. The rocky NAFTA talks have raised many suspicions that the US is trying to make Canada and Mexico walk away from negotiations. Both said Thursday that they will not do that.