Class Structure

I think there is a lot of truth to this:

It is sufficient to argue that the class structure constitutes the central mechanism by which various sorts of resources are appropriated and distributed, therefore determining the underlying capacities to act of various social actors. Class structures are the central determinant of social power. Consequently, they may determine what kinds of social changes are possible, even if they do not functionally determine the specific form of every institution of the society.

- Erik Olin Wright, Classes : p. (31-32)
(You can read the book in PDF form here: link)