Sachs on Family Size

Today's NY Times has a review of Jeff Sach's new book. It concludes:

In an age when we don’t need to have lots of children to work the fields, or to compensate for high infant mortality, Sachs argues that it’s both economically rational — and crucial for a future of sustainable growth — for people to reproduce at a rate close to 2.1 children per family. In his acknowledgments, Sachs thanks his three children.

I also have three kids, but I don't feel a shred of guilt about it, for reasons I explained here.