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In page Jane Jacobs:

"

The Nature of Economies (2000), a dialog between friends concerning the premise: "human beings exist wholly within nature as part of the natural order in every respect" (p. ix), argues that the same principles underlie both ecosystems and economies: "development and co-development through differentiation and their combinations; expansion through diverse, multiple uses of energy; and self-maintenance through self-refueling" (p. 82). Jacobs also comments on the nature of economic and biological diversity and its role in the development and growth of the two kinds of systems.[citation needed]