Your friend who owns an expensive car, is assigned by his company to work overseas for two years. You ask if you may have the car while he is gone. Your friend gives you the title to his car, but you sign an agreement to to return the same year and model of car, in the same condition, when he returns after two years You sell his car now, and after two years you will purchase an equivalent car to return to him. In financial mathematics, what type of transaction is this? This transaction is a