I don't know whether there is an established Danish term for this concept but it basically means the profit margin for a specific customer or transaction in relation to the "pocket price" which is the actual amount of money received for a product or service after discounts have been deducted.

There are some good explanations in this business journal and in the reference links inserted below:
http://download.mckinseyquarterly.com/popr03.pdf

Hope this helps.