Governments worldwide have spent huge sums of money to persuade, compel, cajole, or even trick couples into producing more humans (for those same governments, of course). They’ve tried cash grants, huge tax deductions, generous maternal and paternal leave policies, flexible work arrangements, subsidized daycare, and more. They’ve also tried banning abortion, suppressing contraception use, and serving up public lectures on the virtues of “traditional” family structures. That hasn’t w...