Read this statement from Caesar Augustus.
"I found Rome a city of bricks, and left it a city of marble."
What achievement of Caesar Augustus does this statement reference?
the building of roads
the building of a navy
the beautification of the area
the construction of trade routes

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.