 For example, a pure egalitarian theory will portray rights as instruments for achieving a more equal distribution of advantages. A prioritarian theory will define an optimal distribution in a manner similar to egalitarianism, except that it will give extra weight to the interests of those worse off. Other instrumental theories characterize “optimal distribution” in other ways (Sumner 1987, 171). Instrumental theories that do not define an optimal distribution in terms of maximization may face less pressure than utilitarianism does from concerns about weak rights (Scanlon 1977).