The Bubuti system is used on the Pacific Island of Kiribati. It relates to the principle that all people are equal and deserve equal rights. Under the Bubuti System if someone is approached and says "I bubuti you for your shirt", that person is obliged to give you their shirt. However the next day you can go to the person now wearing your shirt and say "I bubuti you for your lantern", and now you have yourself a lantern.[1]