You have a hypothesis, but do you have evidence supporting your conclusion? A study suggesting that increased access to education, or welfare in general, increases the birth rate among the poor? Maybe an example of a species which, upon a decrease in difficulty raising offspring (I'd accept a decrease in infant mortality as an example), started to produce more offspring than normal?
1. Welfare doesn't mean access to education. At no point have I mentioned welfare, only access to public education, specifically public primary and secondary education.
2. Just because people are having more out-of-wedlock children doesn't necessarily mean they are having more children over all. It could simply mean people aren't getting married anymore.
3. Your first link has the following quote in the introduction section: "a reasonable reading of the evidence to date is that the welfare system may increase non marital childbearing, but the magnitude of its effect may not be large relative to the effect of other factors in contributing to recent increases in nonmarital child bearing in the US. In fact, the simplest evidence indicates that the welfare system has not been largely responsible for the recent increases in nonmarital child bearing."
4. Feeding animals increases population, but that's not the same as increased fertility. If an animal normally gives birth to a litter of 5, and only 3 normally live to adulthood, but now all five live to adulthood, then population will increase even though each couple is producing offspring at the same rate. And I'd also like something showing that human beings would exhibit the same phenomenon, because human behavior is a complicated thing governed by more than evolution.
1. You wrote in your previous comment: " A study suggesting that increased access to education, or welfare in general, increases the birth rate among the poor?"
2. The fact that an increasing number of people are having children out of wedlock should be very concerning. Many social problems are strongly correlated with high single parenthood rates. The evidence suggests to me that more welfare encourages single parenthood by changing its costs/rewards.
3. Even that finding is shocking in how anti-welfare it is, given the well-documented leftist bias in the social sciences. Even accepting it at face value, it points to a definite negative effect. Over time, it could get worse due to natural selection.
4. I can do some research and see what I find. As for human populations, I think the most likely outcome is that they inevitably reach a state of evolutionary optimal behavior.
