What's common between the transatlantic slave trade and the fur trade?

Both the trades were between the continents of Asia and Europe.

Explanation:

The transatlantic slave trade was the trade which was done for taking slaves from the countries in Asia to the European countries for working in different sectors.

This was a forced migration of the slaves from Asia to Europe. On the other hand, the fur trade was the trading of the fur from the Asian countries to the European countries which was used to make tools, clothes and so on.