I don't think anyone, certainly not I, have claimed public spending is not a variable. But raising spending is also not the magic potion it is described to be, without addressing the other variables, even the obvious ones that won't be mentioned, whatever they may be.
Proposition 13 was an interesting initiative. It capped property taxes, which traditionally funded school systems, but it also transferred funding responsibility to the state, which funds districts based on ADA and in a way, equalizes the playing field between richer and poorer districts. If that result has had a negative effect on perfrmance then other states like Vermot may want to rethink their puhes for statewide funding.
If memory serves Utah is on the bottom for public spending on schools yet ranks in the middle as far as performance.
But none of that addesses my question. In district, where funding is equalized, what would account for the disparity in performance?