A niche is created by the intersection of resource constraints— an abstract resource space consisting of a unique combination of resources that could permit a form to survive there. Forms thus either take advantage of a niche resource space or fail.
~ Howard E. Aldrich

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Environmental niches are distinct in combination of resources and other constraints that are sufficient to support organizational form. Organizational forms, then, are organized activity systems oriented toward exploiting the resources within a niche.
~ Howard E. Aldrich

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Organizations are goal-directed, boundary-maintaining, activity systems.
~ Howard E. Aldrich

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