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I haven't seen anyone mention the other issue with having large families. There are already more people than we can sustain at US living standards, Every extra child adds to the pressure on pollution, the environment, raw materials, land, water, and energy.
In my case we stopped at 1 child.
Partly because as one of four I felt I clearly missed out in ways that would have made a huge difference to my life. I did not want that to happen to my children.
Partly because I wanted to do other things with my life as well as raising children. Until you have children you do not appreciate the huge impact they have on time, money and most importantly on your energy - not to be a super-parent but just to be a good enough parent.
But also partly because of the "Crowded Earth" factor.
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Generally speaking, when I search for literature on peer effects, the information is sparse and confusing. I'm not too surprised, since such effects are much more difficult to disentangle than heritability and shared environment.
My working hypothesis is that:
Peer effects matter a lot, but only up to a certain threshold of peer quality, and this threshold is basically what people intuitively perceive as sufficiently respectable company for their kids. So, basically, underclass peers will ruin your kids, but upper-class or genius peers won't improve things relative to the company of ordinary middle-class kids. (Just like downright abuse will ruin them, but helicopter parenting won't improve them.)
In order to quality for adoption, people must pass through sufficiently strict checks that they are highly unlikely to provide an environment below this threshold. So there aren't any good natural adoption experiments that expose kids to underclass peer groups.
I'd be curious to hear about any contrary evidence, though.
Maybe it does, but this really is my honest impression of what the situation looks like to a typical person aspiring to a middle-class lifestyle these days. I'm curious if you would disagree with any of the following statements, which seem to be roughly equivalent to what I wrote above (all given in the context of contemporary North America):
A house in a place where your kids will grow up with -- and, in particular, go to school with -- kids from respectable middle-class families is very expensive. In many places, and especially prosperous centers of economic activity that offer good career opportunities, it is somewhere around an order of magnitude above the median yearly household income.
Unless one is extraordinarily wealthy, to obtain such a house, one has to get into debt that is, just like the house price, enormous relative to one's income.
Such debt, due to its sheer size, can't be repaid in any time shorter than several decades. Just to pay the interest, let alone to make any dent in the principal, one must part with a significant part of one's income during this period. In this situation, a plausible bad luck scenario like job loss, health problems, etc. can easily push one into insolvency.
Worse yet, this situation implies that the bulk of one's net worth is completely non-diversified and invested in a single asset -- of a sort that is notoriously prone to bubbles and price crashes. Even worse, the occurrence of such crashes is positively correlated with bad economic conditions that make job loss and decreased earning power especially likely.
Even with a minimalist approach to parenting, raising kids is expensive. Each additional kid makes it less likely that one will manage to remain solvent under the above described conditions.
Sufficiently bad financial ruin can plausibly put one into a situation where one is no longer able to afford to ensure a peer group for one's kids that will be above the threshold where bad peers exercise significant bad influence. Also, generally speaking, below a certain class threshold, all sorts of social pathologies are rampant to a degree that seems frightful to a typical middle-class person -- and, again, bad financial ruin can make one unable to afford to insulate oneself from people that fall below this threshold.
Taken together, (1)-(6) makes for a rather stressful existence, in which having more kids will seem to a lot of people like an additional burden in an already difficult situation, and an additional risk in an already uncomfortable gamble.
I'd be really curious to see where exactly our opinions diverge here.
I agree with you about peer effects but I think you assume without cause that they are lasting. Twin studies, despite their flaws, would seem to be the best way to establish that, whatever their influence now, differing peer groups and adolescent environments will not lead to different adult characteristics. Any efforts that parents take NOW to improve children's peer groups, in order to improve current well-being, are valuable. But if the effect fades over time, then the harm is less than most parents think it is, and therefore on the margin children are less costly and Caplan's conclusion is warranted.