In/of

Hi, Ahmad,

When "traffic" has the meaning you mentioned, it takes the preposition in, as can be seen in the section of the Oxford Collocations Dictionary copied below.

I guess the choice of this preposition has to do with the idea that what is introduced by the preposition is not conceived of as the object that is illegally bought and sold but as the area or field in which the crime is committed (traffic in goods, traffic in arms, traffic in drugs).

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