Why do people keep having Children?

I found the podcast titled "Why do people keep having Children?" on Podcastalley.com/  I chose it simply because of the title. The podcast is actually from an economics stand point and discussed the biological, sociological and economical reasons why people have children. It also discusses cultural events and ideals that affect fertility.  It was really interesting and quite intellectual actually.  Fair warning - it is really long. Here is the link to the feed- enjoy!