This is a classic case of Baumol's cost disease. There isn't really a way for productivity to increase in the child care sector, you're always going to need a similar ratio of workers to children, but those workers also need their wages to keep up with inflation. The way it plays out in the US is everyone loses: the employees are underpaid, the employers are low-margin, and it is still too expensive for families. Child care companies can't pay the workers a fair wage while remaining profitable and keeping prices low enough for families, so we end up in this awful equilibrium where it sucks for everyone.