"It's incredibly expensive"
It is possible that the second obeservation has somthing to do with the first... and perhaps more than the Montessori method itself does.
Also, where we are Montessori was no more expensive than a Catholic private school. But to my eyes, the Catholic school just looked like public school, but obviously more upscale (and also teachers have more freedom, small classrooms).
But I was attracted to to Montessori because of the methods. For example, if a child is focused on an activity, the teacher will not interrupt them just because 'geography hour is over' or some arbitrary boundary. Letting the kids develop focus and concentration at an early age was a big selling point for me.
Clearly, having money doesn't make you a good parent. And you don't have to have money to be a good parent. But it does undeniably have an impact on the statistics.
I couldn't agree more. In fact, I grew up in an extremely poor family, and my mother is an excellent mother!
But I also know how difficult it can be for a poor, single parent.
My point was that those who would choose to pay for their children to attend a Montessori school are a self selecting group, and I am not confident that if you took an average public school and turned it into a Montessori school that it would work as well as your private school. (It might very well work better than an average public school, though.)