Evolutionary theory asserts that as environmental variables equalize the remaining differences between populations will tend to be derived from parenting and heredity which from an evolutionary standpoint are almost the same thing. Thus it is found that in poor countries with very unequal access to nutrition and schooling, investing in schools narrows achievement gaps because more funding pays for school meals and more instruction. In rich countries nutrition and access to instruction are much more equal but parental inheritance isn't. Hence the finding that more inputs don't help in richer countries.
It's instructive that this was known and downplayed in 1966 by the Federal Coleman Commission tasked with assessing education equality. And Americans have been blowing greater and greater wads of money ever since in a vain attempt to equalize that which is already largely equal to remediate that which money can't fix.
Of course the bureaucrats and their union and Democrat party friends have turned these lies into gold. Which us why they're still being told. Details at the link.
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