Tim Worstall nicely explains.
What the congresswoman meant to talk about was John Maynard Keynes and his essay “Economic Possibilities for our Grandchildren.” In this essay, Keynes muses that by about 2030, we'd all be so rich that we'd only work 15 hours a week, which is what Ocasio-Cortez tries to cite to argue that this hasn't happened because of economic inequality, i.e., the rich idle while the rest of us labor on, or something.
This is not correct. In fact, much of that reduction in labor has happened, but it is so-called women’s work that has vanished.
BONUS: Washington Post columnist lectures AOC about how to eat breakfast in DC.