During the Golden Age, who could take part in government? A: middle class
B: anyone
C: upper class
D: rulers
This is over Greece. So if your wondering.

An informal structure in a bureaucracy would be something like so-called "office politics". where there's a formal structure set up for the organization, but then an informal subculture as well that has a way of organizing the bureaucracy further. this can be positive because it sets up an added degree of organization, albeit informal, within the bureaucracy.