What aspect of the united states' diversified economy is harder for smaller countries like cuba or brazil to match?
a. low-cost labor
b. banking options
c. immigration limits
d. natural resources

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.