Perhaps I should have expected this, given that it's pitched as an alternative economics textbook, but this is really pretty basic. If your previous reading has already made you familiar with, say, the Gini coefficient and some of the criticisms of GDP, I'm not sure there's much for you here. If you've no familiarity with economics, this would probably be a good place to start as it's at least much more human than other economics textbooks -- no seeing actual people as subordinate to supply/demand curves.