Angela Duckworth: How do you decide whether or not to have children? Stephen Dubner: I imagine there's a very complex algorithm that shapes what the answer is. She says gone are the days of needing all those kids to work the family farm. And these changes, if you look at global fertility rates, especially in richer countries, they're reflected unbelievably starkly.
Why have fertility rates dropped so dramatically? Do fathers or mothers get more happiness from parenting? And how does birth order affect a child’s future?