Citigroup 2月13日报告，13页。
　　A significant rise in protectionism is a material and rising risk for the global economic outlook .The US accounts for much of this risk and the two main areas to currently watch in our view are：i）potential border tax adjustments（BTA）in the US tax code，and ii）potential US-China trade tensions.The forthcoming elections may increas e protectionist sentiment in Europe，adding further obstacles to cross-border economic activity.