This was well-covered in George Gilder's "Sexual Suicide" in the 70's (later re-issued as "Men and Marriage"). It's an unavoidable fact of human nature that X%

This was well-covered in George Gilder's "Sexual Suicide" in the 70's (later re-issued as "Men and Marriage"). It's an unavoidable fact of human nature that X% of women in the workforce are going to drop out to have children, and the market adjusts for this fact.