I did look up Wikipedia on population ethics and considered

"the theory of when one state of affairs is better than another, where the states of affairs may differ over the number of people who ever live".

to be matching if you generalize by substitution of "number of people" with "well-being of people".

But I admit that politics

the practice and theory of influencing other people. Politics involves the making of a common decision for a group of people a uniform decision applying in the same way to all members of the group

contains a matching with choosing among available actions in a group for the benefit of the group. The main difference to what I meant (ahem) is that politics describes the real thing with unequal power whereas population ethics prescribes independent of the decision makers power.