Black Market
Items such as food or materials that are not illegal to trade.
trade
contraband
Trade is the transfer of ownership of goods and services from one person to another
The general term for this is "triangular trade".
Conflict diamonds are only traded illegally. Otherwise, trading in any kind of goods that have been stolen is illegal.
The exchange of goods and services between countries is called international trade.
Some context clues for the word "trafficked" could be words like "illegal," "exploitation," "smuggling," "forced labor," or "black market." These clues suggest that the term is associated with the illegal trade or transportation of goods or people, often for profit.
A sudden dip in demand for the goods involved. A general slump means there is an overall reduction in trade.
That is called Trade Barter Commerce Swapping Returns (an probably a whole lot more)
This is known as bartering.
trade deficit