Caroline Hagen Kjos is another heiress with an inherited fortune of $2.5bn, but she's also one of the hardest workers on this entire list, so writing her off as 'just another heiress' would be wrong. She's entered the family business - which, many years ago, really was just a humble family business - and is now the chairperson. That business is Canica AS.
The name won't mean much to a non-European audience, but Canica was the holding company behind the RIMI grocery stores, which were once as common across Scandinavia as Walmart stores are in the USA. Her grandfather started the business with just one shop, and subsequent generations opened more and more until the grocery arm of the business was eventually sold in 2011. Now Canica, with Hagen Kjos at the helm, purchases businesses in many different industries.