This paper defends my argument for subsidizing child-bearing and the widely used representative decision-maker methodology against the recent criticism of Kemp (2005) that the assumption of identical decision-makers is incompatible with the assumption that each decision maker takes the choices of others as given. In the realworld, decision makers are clearly heterogeneous. But the assumption that they are identical allows simplicity and focussing on the essential points. Even at the level of abstract theory, identical decision-makers may still takes the choices of others as given. A simple experiment to test this is suggested but not done.

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