In a far far land, there was a long war.
Many men died in that war, and when it was over
there were not enough men to marry all the women in the kingdom.
The king wanted balance between men and women, so he issued an order that any woman who gives birth to a girl, will stop having children after that.
His theory was that there would be several families with one girl and one or no boys,
but there would also be families with several boys and only one girl, and so after a few years the number of males in the kingdom would increase.
What was wrong with the king's plan and why won't it work?