Why education can’t cure inequality

The Boston Globe reports:

there are two ways to combat inequality. Either you change the economy so that workers take home a larger share of the economic gains, or you change the tax system so that the highest earners pay more and the middle class benefits more.

What doesn’t seem to work is a focus on improving education. Even if we could dramatically increase the number of college graduates, or greatly expand access to high-quality education, the United States would likely remain an extremely unequal place, a country where even college grads are being left behind.

You mean education spending isn't the answer to everything?