Life is organised into a hierarchy, and selection can and does act at every level of that hierarchy.

ECONOMIST: A master of evolution takes a last long look at Darwin

In 1996, Bob Dole took his party's commitment to hierarchy to a higher level, proving it was stronger than all the available evidence.

CNN: Could Gingrich Top GOP's 2000 List? - 01-10-98

More damning: the younger, less experienced and at a lower level in the hierarchy you are the worse it is.

FORBES: Do You Sabotage Yourself by Using Weak Language?

Therefore, resources tend to be managed at the executive level, often through a sophisticated hierarchy and a well-developed information system.

FORBES: HR Analytics And Competitive Advantage

The government's answer to nature's fury is a hierarchy of disaster co-ordinating councils, established at local, regional and national level.

ECONOMIST: No disaster in the Philippines