Original sentence: Malthus's main work presents a theory of irremediable, if not untreatable, scarcity: one could perhaps therefore classify it with a general category called Scarcity Theory.Three of his works present material that fall under a categorization of theory of surplus value:
Edited sentence: Malthus's main work presents a theory of irremediable, if not untreatable, scarcity.Yet, contrarily, three of his works present a theory of surplus: