3. They were active in the slave trade.
Source: timeslipsblog.wordpress.com
One of the Vikings’ major economic trades is human trafficking. Many Vikings got rich by abducting people from various settlements around Northern Europe, including Anglo-Saxon, Celtic, and Slavic establishments. Whenever they pillage a village, they would nab women and young boys and sell them as slaves. These slaves would usually work on the farm or in the household. It would have been an impossible feat to maintain the Vikings’ property without the labor of slaves, which they called “thralls.”