For example, during the 1992 US presidential campaign, Ross Perot argued that ratifying the North American Free Trade Agreement would lead to a “giant sucking sound,” as US jobs migrated to Mexico and American workers’ wages fell. And many countries have introduced minor – and not so minor – impediments to trade since WWII.
当然，自那以后，保护主义压力偶尔会出现。例如，1992年美国总统竞选期间，候选人罗斯·佩罗特（Ross Perot）认为批准北美自由贸易协议将导致“怨声载道”，因为美国的就业职位将因此向墨西哥迁移，并且美国工人的工资会下降。与此同时，自二战结束以来许多国家都构筑了小规模——或者是不那么小规模——的贸易壁垒。