There's a good TED talk which illustrates the correlation between a country's wealth and birth rate: http://www.ted.com/talks/hans_rosling_shows_the_best_stats

There's a good TED talk which illustrates the correlation between a country's wealth and birth rate: http://www.ted.com/talks/hans_rosling_shows_the_best_stats_you_ve_ever_seen http://www.ted.com/talks/hans_rosling_shows_the_best_stats_y...