Michael eats hamburgers and smores. if michael eats two hamburgers and one smore, he would give up half hamburger in order to eat one smore more (his welfare remaining constant). when he eats smores, he wants more and more. indeed, he would give up one hamburger more for eating his third smore (his welfare remaining constant). because of this, we can say that michael’s mrs of smores for hamburgers is not decreasing.