This post describes beautifully the chasm between management and leadership, using the metaphors of startups and companies:

“We know that a startup is a temporary organization designed to search for a repeatable and scalable business model. The corollary for an enterprise is:
A company is a permanent organization designed to execute a repeatable and scalable business model.
Once you understand that existing companies are designed to execute, then you can see why they have a hard time with continuous and disruptive innovation.”

http://feeds.inc.com/~r/home/updates/~3/MGyJa_cFKDo/story01.htm