The structure of the Swedish society is somewhat different in the sense that most families leave their children at daycare starting around 2 years old.
Unless you have more children, where you are allowed to leave the older child in daycare for a few days per week at that cost.
The economy behind this is rather obvious. It is better for the economy as a whole to leave children with professionals taking care of 4-6 children per teacher and let the (supposedly educated) mom work with what she is or will become specialized in.
Mentioning moms here, but the ambition is to have fathers stay as much home with the children as their mom, but this is comparing to e.g. USA.
And not mentioning the other reasons to want to raise your children full time, there are obvious and understandable reasons for that, and you are obviously free to do that and many do. But there are also good reasons for letting them meet other children in a well run daycare too.