It's by considering all these things--the risk of losing your job one way minus risk of losing it another,the extra money you make if your industry is shielded from foreign competition minus the extra money you pay for goods and services --that you reach the conclusion that on average,free trade benifits us all.
此长句该如何翻译？minus在其中如何翻译？求详解，谢谢了！

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