Say we assume that Singer’s version of utilitarianism and that donating to OXFAM would save lives is true. Bentham claims that there are quantitative differences between happiness such as happiness and duration. I agree that Narveson is correct that it is not obvious that it would add more sum of happiness if we donate to OXFAM rather than support the opera. This is because there are so many different qualities of happiness, of which there is no true quality that is most important. Say that donating to OXFAM generates a high intensity of pleasure and supporting the opera creates a long duration of happiness. There is no choice that obviously creates more happiness than the other one.