You're not addressing my point.
The right justifies tax cuts on the basis that they will grow the economy (clearly true) enough to pay for themselves (to date, apparently never.) You're making the exact same argument that education spending will grow the economy (clearly true) enough to pay for itself (for which you are providing no evidence.)
Well, we won't know unless it happens, right?
And that's not addressing it, either.
We have two relevant data points that I am aware of:
Poland: Rebuilding the education system from the ground up with a goal of fairness didn't change the outcome.
Kansas: Throwing 10 figures at trying to improve education for the disadvantaged did nothing.
And a quasi-point: The Cultural Revolution stripped away wealth--but there's still a considerable relationship between pre-Revolution wealth and how the next generation fared. It's not as clear because educational advantages could persist.
Your point is what, exactly? Poland (without any links, context or anything other than a single sentence--excuse me: incomplete sentence. Kansas, again with out any data, context, etc. Simply your say so.
I suppose you mean China when you talk about the Cultural Revolution? Again, your point is so unclear and unformed that it is not possible to address it.
Your 'data points' are not data. Their relevance is undetermined.
However, we DO know that in the US, higher levels of education correlates with significantly higher earnings. This effect is actually smaller in the years right after entering the workforce but escalates throughout the working careers of people.
People with college degrees usually outearn people without college degrees by a significant amount, regardless of what that degree is in.