(Abstract: We have the notion that people can have a "total utility" value, defined perhaps as the sum of all their changes in utility over time. This is usually not a useful concept, because utility functions can change. In many cases the less-confusing approach is to look only at the utility from each individual decision, and not attempt to consider the total over time. This leads to insights about utilitarianism.)
Let's consider the utility of a fellow named Bob. Bob likes to track his total utility; he writes it down in a logbook every night.
Bob is a stamp collector; he gets +1 utilon every time he adds a stamp to his collection, and... (read 804 more words →)
I think the key difference is that delta utilitarianism handles it better when the group's utility function changes. For example, if I create a new person and add it to the group, that changes the group's utility function. Under delta utilitarianism, I explicitly don't count the preferences of the new person when making that decision. Under total utilitarianism, [most people would say that] I do count the preferences of that new person.