What is the purpose of a hierarchical organization?

By a rough approximation I think this is how we got here. For millions of years humans lived in small groups. Then agriculture came along and larger groups of humans lived together. There were cities and nations. At some point groups organized militaries to defend their new cities and nations. For thousands of years the only large organizations were militaries. Then the industrial revolution came along and larger groups of humans worked together. For hundreds of years corporations grew. Now we have multinational corporations made up of knowledge workers spread across the globe.

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