Bundles And Bundles Of Joy?

Bryan Caplan makes the case for having more children. Will Wilkinson counters:

Increases in average levels of education, levels of disposable income,gender equality, and access to birth control -- that is, increases inthe ability of people (and especially women) to deliberately controlthe conditions of their own lives -- generally lead people to choose asmaller rather than larger number of children. As far as I can tell,Bryan's response is that it "lacks perspective" to take at face valuethis...