With industrial tariffs already dramatically reduced most potential benefits of trade liberalization have already been grasped. Estimates of the benefits of further trade liberalization are often surprisingly low – no more than a few percentage points of global GDP.
由于各行业关税都已大大减少，大多数贸易自由化的潜在好处已经被开发。估计进一步的贸易自由化的好处往往出奇地低——不超过全球GDP的几个百分点。