the trade is restricted by a subsidy on the production of the importable or a tax on the production of the exportable.
ie:protection takes the form of a subsidy on the output of the importable or a tax on the output of the exportable rather than
an import tariff,which would impose an additional consumption cost.
这句话什么意思？ 怎么体现的是贸易保护？
最后结尾说的是进口关税会增加消费者成本还是说的是这种保护会增加消费者成本？看不懂  求教下各位谢谢？