My comment doesn't argue that intelligence is negatively correlated with having children, it argues that it is difficult to incentivise intelligent people to ha

My comment doesn't argue that intelligence is negatively correlated with having children, it argues that it is difficult to incentivise intelligent people to have children. Although looking at figures for 2010 it does seem that there is a negative correlation between income and number of births (at least in the US). http://www.statista.com/statistics/241530/birth-rate-by-family-income-in-the-us/ http://www.statista.com/statistics/241530/birth-rate-by-fami... Survival rate is unlikely to be highly correlated with income in a first world country because even the poor have relatively good healthcare. The group most likely to have children are those earning $10,000 per year or less, probably because at that income level the state will pay most of the costs associated with child rearing. In fact in some cases having children might make a person better off financially due to higher priority for welfare or public housing etc.