The spread of modernity is bringing fertility rates down to replacement level for most of the world. That is a good thing. Added to www.audiovideo.economist.com in October 2009 Subscribe NOW to The Economist: econ.st/1Fsu2Vj Get more The Economist Follow us: twitter.com/TheEconomist Like us: www.facebook.com/TheEconomist View photos: instagram.com/theeconomist/ The Economist videos give authoritative insight and opinion on international news, politics, business, finance, science, technology and the connections between them.