When a population pyramid indicates that a country’s population has a high percentage of young people, that usually means that the population is

Expansive

Explanation:

When a population pyramid indicates that a country’s population has a high percentage of young people, that usually means that the population is expansive.

Expansive population pyramids show populations which have a higher percentage of people in younger age groups. Such populations with this shape usually have high fertility rates with lower life expectancies.

These types of populations usually represent the developing nations but some of the third world countries also have expansive population pyramids.

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.