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Properties of the example species. (a) Weighted age‐specific fertility f weighted(x) of small and large adults, with weights defined by the relative costs of small and large offspring (large 10 times more expensive than small). (b) The age‐specific fertility f mixed(x) of a mixed cohort of small and large parents, with the mixing distribution given by the reproduction of the stable population structure. (c) The age‐specific weighted fertility f(x) of the mixed cohort.
