In regard to Sami (in Norway) that had reindeer herds; when these Sami moved their herds (every year), then they would interact with people who lived permanently on the coast; the interaction also included "verdde": a friendship of convenience; for example, Sami needed milk and fish after having been on a plateau (or highland) for some weeks; Sami might need repair of equipment; trade was done: People from the coast traded fish for meat from reindeer.