Canada is the largest trading partner of the United States, and the two governments have begun negotiations for a free trade agreement which would tie their relationship even closer. This study analyzes the difficult problems that must be addressed in the negotiations - including quite different perceptions in the two countries of what constitutes fair trade. It suggests several possible ways of reducing differences over subsidies and countervailing duties. It also addresses the exchange rate relationship between the two dollars, and how this affects the trade outlook.An appendix by John Williamson calculated a fundamental equilibrium exhange rate for the Canadian dollar.