20 SOCIAL SCIENTIST nourishment which the producer provides himself can serve as a last security for existence. 18 Ernest Feder, "La pequana revolucion verde de McNamara", Comercio Exterior,. Juh 1976. 19 Susan George, Wie die anderen sterben, Berlin, 1978, p 183. 20 Lester R Brown, By Bread Alone, New York/Washington, 1974, p 225. 21 Holis Chenery, Monteh S Ahluwalia, C L G Bill, John H Duloy and Richard Jolly, Redistribution with Growth, Oxford, 1974, p 48.