This is important. Amazingly, socialist Sweden attempted radical partial privatization of its schools with about one fourth of students now attending publicly financed privately managed schools (roughly charter schools). This daring reform was followed by a dramatic decline in scores on the PISA international standardized test including the largest decline in math scores of all PISA countries.
It is very odd that Sweden tried this. It is important that it failed. I have long argued that even if something works in Nordic countries, it is irrational and nordtopian to believe it will work elsewhere. If charter schools failed in Sweden presumably because of moral hazard and a lack of team spirit, then they can fail anywhere.
Also, as in the case of health insurance and Medicare vs Medicare advantage, these data cast doubt on the widespreadd presumption that the private sector is always more efficient than the public sector.