But there is no reason why trade should grow faster than GDP forever. Indeed, even if there were no trade barriers at all, trade might grow significantly more slowly than GDP in some periods.
但是贸易不可能永远比GDP增长得更快。事实上，即使没有贸易壁垒，贸易增长也可能会在某些时期明显慢于GDP增长。有几方面因素使得我们正在进入这样一个时期。