Negotiation is a type of Activity. Activity is related to Rest. 
Consumer is a type of User. Person does not want (to) Consumer. Person is related to Affair. Affair is related to People. 
Negotiation --IsA--> Activity <--RelatedTo--> Rest 
User <--IsA-- Consumer <--NotDesires-- Person <--RelatedTo--> Affair <--RelatedTo--> People 