> I propose the Baby Money Index, which is the income per capita multiplied by the fertility rate squared.<p>It doesn't make sense to score positively for fertility rate (babies born per woman) without doing anything to consider <i>whether those babies actually survive</i>, especially when there's an inverse correlation between number-of-babies and infant mortality.<p>This mistake compounds (literally) when <i>squaring</i> that number as a really weird way to guess at potential grand-kids, since each of those births have to <i>reach adulthood</i> in order to even have a <i>chance</i> of reproducing.