Hacker News Reader

> Canada becomes first G20 country to ban trade in shark fins

I'm not a native English speaker and was expecting s/in/with since I read you are not allowed to use shark fins as transportation for trade.

"trade in shark fins" is correct, "shark-fin trade" would be too; "trade with shark fins" would be weird. Compare the frequencies for a more common commodity: https://books.google.com/ngrams/graph?content=trade+in+wheat...

"Trade with shark fins" sounds like you'd be using the shark fins as currency to me, that is to say grammatically correct but generally nonsensical.