 The contest between will-based and interest-based theories of the function of rights has been waged for hundreds of years. Influential will theorists include Kant, Savigny, Hart, Kelsen, Wellman, and Steiner. Important interest theorists include Bentham, Ihering, Austin, Lyons, MacCormick, Raz, and Kramer. Each theory has stronger and weaker points as an account of what rights do for rightholders.