"Good access to education" means more time spent in formal schooling, and later marriage. This alone accounts for most of the decrease in fertility; even if the

"Good access to education" means more time spent in formal schooling, and later marriage. This alone accounts for most of the decrease in fertility; even if the probability of having children per year between two groups is constant, if one group marries at 25 on average and the other at 35, the first group will be 3x more likely to have children (since it has 15 years until 40, the rough end of fertility, while the other has just 5 years until 40).