  Closely connected with the issue of the foundations of moral norms is the question whether moral requirements are natural or conventional. Hobbes and Mandeville see them as conventional, and Shaftesbury, Hutcheson, Locke, and others see them as natural. Hume mocks Mandeville’s contention that the very concepts of vice and virtue are foisted on us by scheming politicians trying to manage us more easily. If there were nothing in our experience and no sentiments in our minds to produce the concept of virtue, Hume says, no lavish praise of heroes could generate it. So to a degree moral requirements have a natural origin. Nonetheless,Hume thinks natural impulses of humanity and dispositions to approve cannot entirely account for our virtue of justice; a correct analysis of that virtue reveals that mankind, an “inventive species,” has cooperatively constructed rules of property and promise. Thus he takes an intermediate position: some virtues are natural, and some are the products of convention. 