Our desires and satisfactions are often relative not only to what others have but also to what we ourselves have become accustomed to. A small amount of tasteless food can be the source of immense satisfaction to a very hungry person. Is the marginal satisfaction gained by upgrading from codfish to jumbo prawns or from processed cheese to brie as great as the marginal satisfaction in going from one cup of rice per day to two? The marginal cost of the last improvement is surely far less.